{"id":470,"date":"2026-04-18T05:55:43","date_gmt":"2026-04-18T05:55:43","guid":{"rendered":"https:\/\/harshad-sonawane.com\/blog\/?p=470"},"modified":"2026-04-07T10:15:48","modified_gmt":"2026-04-07T10:15:48","slug":"jvm-tuning-low-latency-applications","status":"publish","type":"post","link":"https:\/\/harshad-sonawane.com\/blog\/jvm-tuning-low-latency-applications\/","title":{"rendered":"How to Tune JVM for Low-Latency Applications"},"content":{"rendered":"<p data-start=\"221\" data-end=\"475\">Modern applications\u2014from real-time trading systems to high-frequency APIs\u2014demand <strong data-start=\"302\" data-end=\"328\">consistent low latency<\/strong>. While <a href=\"https:\/\/harshad-sonawane.com\/blog\/reduce-cloud-costs-java-applications\/\">Java<\/a> provides excellent performance, improper <a href=\"https:\/\/harshad-sonawane.com\/blog\/java-memory-management-heap-gc-best\/\">JVM<\/a> tuning can introduce <strong data-start=\"407\" data-end=\"474\">GC pauses, memory bottlenecks, and unpredictable latency spikes<\/strong>.<\/p>\n<p data-start=\"477\" data-end=\"597\">This guide dives deep into <strong data-start=\"504\" data-end=\"539\">practical JVM tuning strategies<\/strong> to help you achieve predictable, low-latency performance.<\/p>\n<hr data-start=\"599\" data-end=\"602\" \/>\n<h2 data-section-id=\"109a9za\" data-start=\"604\" data-end=\"651\">Understanding Latency in JVM Applications<\/h2>\n<p data-start=\"653\" data-end=\"709\">Latency in Java applications is primarily influenced by:<\/p>\n<ul data-start=\"711\" data-end=\"880\">\n<li data-section-id=\"1n611in\" data-start=\"711\" data-end=\"747\"><strong data-start=\"713\" data-end=\"747\">Garbage Collection (GC) pauses<\/strong><\/li>\n<li data-section-id=\"16izzn9\" data-start=\"748\" data-end=\"796\"><strong data-start=\"750\" data-end=\"796\">Heap sizing and memory allocation patterns<\/strong><\/li>\n<li data-section-id=\"1v25w9a\" data-start=\"797\" data-end=\"834\"><strong data-start=\"799\" data-end=\"834\">Thread scheduling and CPU usage<\/strong><\/li>\n<li data-section-id=\"d3kpf5\" data-start=\"835\" data-end=\"880\"><strong data-start=\"837\" data-end=\"880\">JIT (Just-In-Time) compilation behavior<\/strong><\/li>\n<\/ul>\n<p data-start=\"882\" data-end=\"967\">For low-latency systems, the goal is not just speed\u2014but <strong data-start=\"938\" data-end=\"966\">consistency (low jitter)<\/strong>.<\/p>\n<hr data-start=\"969\" data-end=\"972\" \/>\n<h2 data-section-id=\"1qpi568\" data-start=\"974\" data-end=\"1022\">Step 1: Choose the Right Garbage Collector<\/h2>\n<p data-start=\"1024\" data-end=\"1080\">Selecting the correct GC is the most impactful decision.<\/p>\n<h3 data-section-id=\"1el77oc\" data-start=\"1082\" data-end=\"1120\">Recommended GCs for Low Latency<\/h3>\n<div class=\"TyagGW_tableContainer\">\n<div class=\"group TyagGW_tableWrapper flex flex-col-reverse w-fit\" tabindex=\"-1\">\n<table data-start=\"1122\" data-end=\"1386\" class=\"w-fit min-w-(--thread-content-width)\">\n<thead data-start=\"1122\" data-end=\"1153\">\n<tr data-start=\"1122\" data-end=\"1153\">\n<th data-start=\"1122\" data-end=\"1127\" data-col-size=\"sm\" class=\"\">GC<\/th>\n<th data-start=\"1127\" data-end=\"1138\" data-col-size=\"sm\" class=\"\">Use Case<\/th>\n<th data-start=\"1138\" data-end=\"1153\" data-col-size=\"sm\" class=\"\">Key Benefit<\/th>\n<\/tr>\n<\/thead>\n<tbody data-start=\"1184\" data-end=\"1386\">\n<tr data-start=\"1184\" data-end=\"1246\">\n<td data-start=\"1184\" data-end=\"1194\" data-col-size=\"sm\"><strong data-start=\"1186\" data-end=\"1193\">ZGC<\/strong><\/td>\n<td data-col-size=\"sm\" data-start=\"1194\" data-end=\"1222\">Ultra-low latency systems<\/td>\n<td data-col-size=\"sm\" data-start=\"1222\" data-end=\"1246\">Sub-10ms pause times<\/td>\n<\/tr>\n<tr data-start=\"1247\" data-end=\"1319\">\n<td data-start=\"1247\" data-end=\"1264\" data-col-size=\"sm\"><strong data-start=\"1249\" data-end=\"1263\">Shenandoah<\/strong><\/td>\n<td data-col-size=\"sm\" data-start=\"1264\" data-end=\"1282\">Large heap apps<\/td>\n<td data-col-size=\"sm\" data-start=\"1282\" data-end=\"1319\">Concurrent GC with minimal pauses<\/td>\n<\/tr>\n<tr data-start=\"1320\" data-end=\"1386\">\n<td data-start=\"1320\" data-end=\"1332\" data-col-size=\"sm\"><strong data-start=\"1322\" data-end=\"1331\">G1 GC<\/strong><\/td>\n<td data-col-size=\"sm\" data-start=\"1332\" data-end=\"1362\">General-purpose low latency<\/td>\n<td data-col-size=\"sm\" data-start=\"1362\" data-end=\"1386\">Balanced performance<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<h3 data-section-id=\"3vtas5\" data-start=\"1388\" data-end=\"1412\">Example JVM Options:<\/h3>\n<div class=\"relative w-full mt-4 mb-1\">\n<div class=\"\">\n<div class=\"relative\">\n<div class=\"h-full min-h-0 min-w-0\">\n<div class=\"h-full min-h-0 min-w-0\">\n<div class=\"border border-token-border-light border-radius-3xl corner-superellipse\/1.1 rounded-3xl\">\n<div class=\"h-full w-full border-radius-3xl bg-token-bg-elevated-secondary corner-superellipse\/1.1 overflow-clip rounded-3xl lxnfua_clipPathFallback\">\n<div class=\"pointer-events-none absolute inset-x-4 top-12 bottom-4\">\n<div class=\"pointer-events-none sticky z-40 shrink-0 z-1!\">\n<div class=\"sticky bg-token-border-light\"><\/div>\n<\/div>\n<\/div>\n<div class=\"w-full overflow-x-hidden overflow-y-auto\">\n<div class=\"relative z-0 flex max-w-full\">\n<div id=\"code-block-viewer\" dir=\"ltr\" class=\"q9tKkq_viewer cm-editor z-10 light:cm-light dark:cm-light flex h-full w-full flex-col items-stretch \u037c5 \u037cj\">\n<div class=\"cm-scroller\">\n<div class=\"cm-content q9tKkq_readonly\"><span class=\"\u037cf\">-XX<\/span><span>:<\/span><span class=\"\u037c8\">+<\/span><span>UseZGC<\/span><br \/>\n<span class=\"\u037cf\">-XX<\/span><span>:<\/span><span class=\"\u037c8\">+<\/span><span>UseShenandoahGC<\/span><br \/>\n<span class=\"\u037cf\">-XX<\/span><span>:<\/span><span class=\"\u037c8\">+<\/span><span>UseG1GC<\/span><\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<div class=\"\">\n<div class=\"\"><\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<p data-start=\"1472\" data-end=\"1496\"><strong data-start=\"1475\" data-end=\"1493\">Recommendation<\/strong>:<\/p>\n<ul data-start=\"1497\" data-end=\"1604\">\n<li data-section-id=\"1w5rib8\" data-start=\"1497\" data-end=\"1554\">Use <strong data-start=\"1503\" data-end=\"1510\">ZGC<\/strong> for critical low-latency systems (Java 11+)<\/li>\n<li data-section-id=\"48yjvu\" data-start=\"1555\" data-end=\"1604\">Use <strong data-start=\"1561\" data-end=\"1569\"><a href=\"https:\/\/harshad-sonawane.com\/blog\/java-garbage-collection-zgc-shenandoah-g1gc\/\">G1GC<\/a><\/strong> if you need stability and maturity<\/li>\n<\/ul>\n<hr data-start=\"1606\" data-end=\"1609\" \/>\n<h2 data-section-id=\"zxp8i1\" data-start=\"1611\" data-end=\"1643\">Step 2: Optimize Heap Size<\/h2>\n<p data-start=\"1645\" data-end=\"1702\">Improper heap sizing leads to frequent GC or long pauses.<\/p>\n<h3 data-section-id=\"1m1uor0\" data-start=\"1704\" data-end=\"1723\">Key Guidelines:<\/h3>\n<ul data-start=\"1725\" data-end=\"1803\">\n<li data-section-id=\"1xugk0m\" data-start=\"1725\" data-end=\"1761\">Avoid too small heap \u2192 frequent GC<\/li>\n<li data-section-id=\"1euwl6o\" data-start=\"1762\" data-end=\"1803\">Avoid too large heap \u2192 longer GC cycles<\/li>\n<\/ul>\n<h3 data-section-id=\"50dp4c\" data-start=\"1805\" data-end=\"1830\">Recommended Settings:<\/h3>\n<div class=\"relative w-full mt-4 mb-1\">\n<div class=\"\">\n<div class=\"relative\">\n<div class=\"h-full min-h-0 min-w-0\">\n<div class=\"h-full min-h-0 min-w-0\">\n<div class=\"border border-token-border-light border-radius-3xl corner-superellipse\/1.1 rounded-3xl\">\n<div class=\"h-full w-full border-radius-3xl bg-token-bg-elevated-secondary corner-superellipse\/1.1 overflow-clip rounded-3xl lxnfua_clipPathFallback\">\n<div class=\"pointer-events-none absolute inset-x-4 top-12 bottom-4\">\n<div class=\"pointer-events-none sticky z-40 shrink-0 z-1!\">\n<div class=\"sticky bg-token-border-light\"><\/div>\n<\/div>\n<\/div>\n<div class=\"w-full overflow-x-hidden overflow-y-auto\">\n<div class=\"relative z-0 flex max-w-full\">\n<div id=\"code-block-viewer\" dir=\"ltr\" class=\"q9tKkq_viewer cm-editor z-10 light:cm-light dark:cm-light flex h-full w-full flex-col items-stretch \u037c5 \u037cj\">\n<div class=\"cm-scroller\">\n<div class=\"cm-content q9tKkq_readonly\"><span class=\"\u037cf\">-Xms4g<\/span><br \/>\n<span class=\"\u037cf\">-Xmx4g<\/span><\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<div class=\"\">\n<div class=\"\"><\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<p data-start=\"1858\" data-end=\"1913\">\u00a0Keep <strong data-start=\"1866\" data-end=\"1879\">Xms = Xmx<\/strong> to avoid dynamic resizing pauses.<\/p>\n<hr data-start=\"1915\" data-end=\"1918\" \/>\n<h2 data-section-id=\"1ajk017\" data-start=\"1920\" data-end=\"1950\">\u00a0Step 3: Tune GC Behavior<\/h2>\n<p data-start=\"1952\" data-end=\"2001\">For predictable latency, fine-tune GC thresholds.<\/p>\n<h3 data-section-id=\"y37uol\" data-start=\"2003\" data-end=\"2016\">For G1GC:<\/h3>\n<div class=\"relative w-full mt-4 mb-1\">\n<div class=\"\">\n<div class=\"relative\">\n<div class=\"h-full min-h-0 min-w-0\">\n<div class=\"h-full min-h-0 min-w-0\">\n<div class=\"border border-token-border-light border-radius-3xl corner-superellipse\/1.1 rounded-3xl\">\n<div class=\"h-full w-full border-radius-3xl bg-token-bg-elevated-secondary corner-superellipse\/1.1 overflow-clip rounded-3xl lxnfua_clipPathFallback\">\n<div class=\"pointer-events-none absolute inset-x-4 top-12 bottom-4\">\n<div class=\"pointer-events-none sticky z-40 shrink-0 z-1!\">\n<div class=\"sticky bg-token-border-light\"><\/div>\n<\/div>\n<\/div>\n<div class=\"w-full overflow-x-hidden overflow-y-auto\">\n<div class=\"relative z-0 flex max-w-full\">\n<div id=\"code-block-viewer\" dir=\"ltr\" class=\"q9tKkq_viewer cm-editor z-10 light:cm-light dark:cm-light flex h-full w-full flex-col items-stretch \u037c5 \u037cj\">\n<div class=\"cm-scroller\">\n<div class=\"cm-content q9tKkq_readonly\"><span class=\"\u037cf\">-XX<\/span><span class=\"\u037ce\">:MaxGCPauseMillis<\/span><span class=\"\u037c8\">=<\/span><span class=\"\u037cb\">50<\/span><br \/>\n<span class=\"\u037cf\">-XX<\/span><span class=\"\u037ce\">:InitiatingHeapOccupancyPercent<\/span><span class=\"\u037c8\">=<\/span><span class=\"\u037cb\">30<\/span><\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<div class=\"\">\n<div class=\"\"><\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<h3 data-section-id=\"1lbd6r3\" data-start=\"2092\" data-end=\"2108\">Explanation:<\/h3>\n<ul data-start=\"2109\" data-end=\"2199\">\n<li data-section-id=\"rgkdq0\" data-start=\"2109\" data-end=\"2148\"><code data-start=\"2111\" data-end=\"2129\">MaxGCPauseMillis<\/code>: Target pause time<\/li>\n<li data-section-id=\"if79e7\" data-start=\"2149\" data-end=\"2199\"><code data-start=\"2151\" data-end=\"2183\">InitiatingHeapOccupancyPercent<\/code>: When GC starts<\/li>\n<\/ul>\n<p data-start=\"2201\" data-end=\"2254\">Lower values = more frequent but shorter GC cycles<\/p>\n<hr data-start=\"2256\" data-end=\"2259\" \/>\n<h2 data-section-id=\"1jdn93h\" data-start=\"2261\" data-end=\"2307\">Step 4: Optimize Threading and CPU Usage<\/h2>\n<p data-start=\"2309\" data-end=\"2357\">Latency-sensitive apps must minimize contention.<\/p>\n<h3 data-section-id=\"1i9izw4\" data-start=\"2359\" data-end=\"2378\">Best Practices:<\/h3>\n<ul data-start=\"2380\" data-end=\"2491\">\n<li data-section-id=\"c9yrfg\" data-start=\"2380\" data-end=\"2408\">Use <strong data-start=\"2386\" data-end=\"2408\">fixed thread pools<\/strong><\/li>\n<li data-section-id=\"1cbvzqm\" data-start=\"2409\" data-end=\"2442\">Avoid excessive synchronization<\/li>\n<li data-section-id=\"1xxv786\" data-start=\"2443\" data-end=\"2491\">Prefer <strong data-start=\"2452\" data-end=\"2491\">non-blocking (reactive) programming<\/strong><\/li>\n<\/ul>\n<p data-start=\"2493\" data-end=\"2501\">Example:<\/p>\n<div class=\"relative w-full mt-4 mb-1\">\n<div class=\"\">\n<div class=\"relative\">\n<div class=\"h-full min-h-0 min-w-0\">\n<div class=\"h-full min-h-0 min-w-0\">\n<div class=\"border border-token-border-light border-radius-3xl corner-superellipse\/1.1 rounded-3xl\">\n<div class=\"h-full w-full border-radius-3xl bg-token-bg-elevated-secondary corner-superellipse\/1.1 overflow-clip rounded-3xl lxnfua_clipPathFallback\">\n<div class=\"pointer-events-none absolute inset-x-4 top-12 bottom-4\">\n<div class=\"pointer-events-none sticky z-40 shrink-0 z-1!\">\n<div class=\"sticky bg-token-border-light\"><\/div>\n<\/div>\n<\/div>\n<div class=\"w-full overflow-x-hidden overflow-y-auto\">\n<div class=\"relative z-0 flex max-w-full\">\n<div id=\"code-block-viewer\" dir=\"ltr\" class=\"q9tKkq_viewer cm-editor z-10 light:cm-light dark:cm-light flex h-full w-full flex-col items-stretch \u037c5 \u037cj\">\n<div class=\"cm-scroller\">\n<div class=\"cm-content q9tKkq_readonly\"><span class=\"\u037ce\">Executors<\/span><span class=\"\u037c8\">.<\/span><span class=\"\u037ce\">newFixedThreadPool<\/span><span>(<\/span><span class=\"\u037cb\">10<\/span><span>);<\/span><\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<div class=\"\">\n<div class=\"\"><\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<p data-start=\"2549\" data-end=\"2560\">\u00a0Monitor:<\/p>\n<ul data-start=\"2561\" data-end=\"2618\">\n<li data-section-id=\"12yn284\" data-start=\"2561\" data-end=\"2578\">CPU utilization<\/li>\n<li data-section-id=\"1v4r4kn\" data-start=\"2579\" data-end=\"2598\">Thread contention<\/li>\n<li data-section-id=\"ksu9np\" data-start=\"2599\" data-end=\"2618\">Context switching<\/li>\n<\/ul>\n<hr data-start=\"2620\" data-end=\"2623\" \/>\n<h2 data-section-id=\"1m0pk8u\" data-start=\"2625\" data-end=\"2667\">Step 5: Reduce Object Allocation Rate<\/h2>\n<p data-start=\"2669\" data-end=\"2709\">High object creation = more GC pressure.<\/p>\n<h3 data-section-id=\"1ne9adv\" data-start=\"2711\" data-end=\"2726\">Techniques:<\/h3>\n<ul data-start=\"2728\" data-end=\"2829\">\n<li data-section-id=\"1tbr8u4\" data-start=\"2728\" data-end=\"2764\">Use <strong data-start=\"2734\" data-end=\"2752\">object pooling<\/strong> (carefully)<\/li>\n<li data-section-id=\"1o5s2b8\" data-start=\"2765\" data-end=\"2793\">Prefer <strong data-start=\"2774\" data-end=\"2793\">primitive types<\/strong><\/li>\n<li data-section-id=\"cvv9dp\" data-start=\"2794\" data-end=\"2829\">Avoid unnecessary object creation<\/li>\n<\/ul>\n<p data-start=\"2831\" data-end=\"2835\">Bad:<\/p>\n<div class=\"relative w-full mt-4 mb-1\">\n<div class=\"\">\n<div class=\"relative\">\n<div class=\"h-full min-h-0 min-w-0\">\n<div class=\"h-full min-h-0 min-w-0\">\n<div class=\"border border-token-border-light border-radius-3xl corner-superellipse\/1.1 rounded-3xl\">\n<div class=\"h-full w-full border-radius-3xl bg-token-bg-elevated-secondary corner-superellipse\/1.1 overflow-clip rounded-3xl lxnfua_clipPathFallback\">\n<div class=\"w-full overflow-x-hidden overflow-y-auto\">\n<div class=\"relative z-0 flex max-w-full\">\n<div id=\"code-block-viewer\" dir=\"ltr\" class=\"q9tKkq_viewer cm-editor z-10 light:cm-light dark:cm-light flex h-full w-full flex-col items-stretch \u037c5 \u037cj\">\n<div class=\"cm-scroller\">\n<div class=\"cm-content q9tKkq_readonly\"><span class=\"\u037c8\">new<\/span><span> <\/span><span class=\"\u037ce\">String<\/span><span>(<\/span><span class=\"\u037cc\">&#8220;example&#8221;<\/span><span>);<\/span><\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<div class=\"\">\n<div class=\"\"><\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<p data-start=\"2872\" data-end=\"2877\">Good:<\/p>\n<div class=\"relative w-full mt-4 mb-1\">\n<div class=\"\">\n<div class=\"relative\">\n<div class=\"h-full min-h-0 min-w-0\">\n<div class=\"h-full min-h-0 min-w-0\">\n<div class=\"border border-token-border-light border-radius-3xl corner-superellipse\/1.1 rounded-3xl\">\n<div class=\"h-full w-full border-radius-3xl bg-token-bg-elevated-secondary corner-superellipse\/1.1 overflow-clip rounded-3xl lxnfua_clipPathFallback\">\n<div class=\"pointer-events-none absolute inset-x-4 top-12 bottom-4\">\n<div class=\"pointer-events-none sticky z-40 shrink-0 z-1!\">\n<div class=\"sticky bg-token-border-light\"><\/div>\n<\/div>\n<\/div>\n<div class=\"w-full overflow-x-hidden overflow-y-auto\">\n<div class=\"relative z-0 flex max-w-full\">\n<div id=\"code-block-viewer\" dir=\"ltr\" class=\"q9tKkq_viewer cm-editor z-10 light:cm-light dark:cm-light flex h-full w-full flex-col items-stretch \u037c5 \u037cj\">\n<div class=\"cm-scroller\">\n<div class=\"cm-content q9tKkq_readonly\"><span class=\"\u037cc\">&#8220;example&#8221;<\/span><span>;<\/span><\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<div class=\"\">\n<div class=\"\"><\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<hr data-start=\"2902\" data-end=\"2905\" \/>\n<h2 data-section-id=\"1yzyed0\" data-start=\"2907\" data-end=\"2949\">Step 6: Enable JVM Performance Flags<\/h2>\n<p data-start=\"2951\" data-end=\"2991\">These flags improve runtime performance:<\/p>\n<div class=\"relative w-full mt-4 mb-1\">\n<div class=\"\">\n<div class=\"relative\">\n<div class=\"h-full min-h-0 min-w-0\">\n<div class=\"h-full min-h-0 min-w-0\">\n<div class=\"border border-token-border-light border-radius-3xl corner-superellipse\/1.1 rounded-3xl\">\n<div class=\"h-full w-full border-radius-3xl bg-token-bg-elevated-secondary corner-superellipse\/1.1 overflow-clip rounded-3xl lxnfua_clipPathFallback\">\n<div class=\"pointer-events-none absolute inset-x-4 top-12 bottom-4\">\n<div class=\"pointer-events-none sticky z-40 shrink-0 z-1!\">\n<div class=\"sticky bg-token-border-light\"><\/div>\n<\/div>\n<\/div>\n<div class=\"w-full overflow-x-hidden overflow-y-auto\">\n<div class=\"relative z-0 flex max-w-full\">\n<div id=\"code-block-viewer\" dir=\"ltr\" class=\"q9tKkq_viewer cm-editor z-10 light:cm-light dark:cm-light flex h-full w-full flex-col items-stretch \u037c5 \u037cj\">\n<div class=\"cm-scroller\">\n<div class=\"cm-content q9tKkq_readonly\"><span class=\"\u037cf\">-XX<\/span><span>:<\/span><span class=\"\u037c8\">+<\/span><span>AlwaysPreTouch<\/span><br \/>\n<span class=\"\u037cf\">-XX<\/span><span>:<\/span><span class=\"\u037c8\">+<\/span><span>UseStringDeduplication<\/span><br \/>\n<span class=\"\u037cf\">-XX<\/span><span>:<\/span><span class=\"\u037c8\">+<\/span><span>OptimizeStringConcat<\/span><\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<div class=\"\">\n<div class=\"\"><\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<h3 data-section-id=\"ynlq0v\" data-start=\"3080\" data-end=\"3088\">Why?<\/h3>\n<ul data-start=\"3090\" data-end=\"3233\">\n<li data-section-id=\"1o3d3cy\" data-start=\"3090\" data-end=\"3135\"><code data-start=\"3092\" data-end=\"3108\">AlwaysPreTouch<\/code>: Avoid runtime page faults<\/li>\n<li data-section-id=\"17t02ig\" data-start=\"3136\" data-end=\"3180\"><code data-start=\"3138\" data-end=\"3159\">StringDeduplication<\/code>: Reduce memory usage<\/li>\n<li data-section-id=\"1t4yp19\" data-start=\"3181\" data-end=\"3233\"><code data-start=\"3183\" data-end=\"3205\">OptimizeStringConcat<\/code>: Improve string performance<\/li>\n<\/ul>\n<hr data-start=\"3235\" data-end=\"3238\" \/>\n<h2 data-section-id=\"b90i2j\" data-start=\"3240\" data-end=\"3286\">Step 7: Monitor and Profile Continuously<\/h2>\n<p data-start=\"3288\" data-end=\"3327\">Tuning without monitoring is guesswork.<\/p>\n<h3 data-section-id=\"8jnkiq\" data-start=\"3329\" data-end=\"3351\">Recommended Tools:<\/h3>\n<ul data-start=\"3353\" data-end=\"3461\">\n<li data-section-id=\"ckt3rh\" data-start=\"3353\" data-end=\"3368\"><strong data-start=\"3355\" data-end=\"3368\">JVisualVM<\/strong><\/li>\n<li data-section-id=\"1p1351l\" data-start=\"3369\" data-end=\"3401\"><strong data-start=\"3371\" data-end=\"3401\">Java Flight Recorder (JFR)<\/strong><\/li>\n<li data-section-id=\"1c0thui\" data-start=\"3402\" data-end=\"3434\"><strong data-start=\"3404\" data-end=\"3434\">JMC (Java Mission Control)<\/strong><\/li>\n<li data-section-id=\"1wv48n9\" data-start=\"3435\" data-end=\"3461\"><strong data-start=\"3437\" data-end=\"3461\"><a href=\"https:\/\/harshad-sonawane.com\/blog\/monitoring-java-applications-prometheus-grafana-kubernetes\/\">Prometheus<\/a> + Grafana<\/strong><\/li>\n<\/ul>\n<h3 data-section-id=\"1jbrd8c\" data-start=\"3463\" data-end=\"3479\">Key Metrics:<\/h3>\n<ul data-start=\"3481\" data-end=\"3543\">\n<li data-section-id=\"1jizgaz\" data-start=\"3481\" data-end=\"3496\">GC pause time<\/li>\n<li data-section-id=\"xvopf5\" data-start=\"3497\" data-end=\"3509\">Heap usage<\/li>\n<li data-section-id=\"1wrxp96\" data-start=\"3510\" data-end=\"3527\">Allocation rate<\/li>\n<li data-section-id=\"vgpcma\" data-start=\"3528\" data-end=\"3543\">Thread states<\/li>\n<\/ul>\n<hr data-start=\"3545\" data-end=\"3548\" \/>\n<h2 data-section-id=\"1jeh20q\" data-start=\"3550\" data-end=\"3593\">Step 8: Benchmark with Real Workloads<\/h2>\n<p data-start=\"3595\" data-end=\"3623\">Synthetic tests can mislead.<\/p>\n<p data-start=\"3625\" data-end=\"3629\">Use:<\/p>\n<ul data-start=\"3630\" data-end=\"3704\">\n<li data-section-id=\"79eivb\" data-start=\"3630\" data-end=\"3669\"><strong data-start=\"3632\" data-end=\"3669\">JMH (Java Microbenchmark Harness)<\/strong><\/li>\n<li data-section-id=\"1i16ipn\" data-start=\"3670\" data-end=\"3704\">Production-like traffic patterns<\/li>\n<\/ul>\n<p data-start=\"3706\" data-end=\"3725\">\ud83d\udc49 Always validate:<\/p>\n<ul data-start=\"3726\" data-end=\"3792\">\n<li data-section-id=\"1cz5diu\" data-start=\"3726\" data-end=\"3757\">99th percentile latency (P99)<\/li>\n<li data-section-id=\"7j23i0\" data-start=\"3758\" data-end=\"3792\">Throughput vs latency trade-offs<\/li>\n<\/ul>\n<hr data-start=\"3794\" data-end=\"3797\" \/>\n<h2 data-section-id=\"1p791x2\" data-start=\"3799\" data-end=\"3829\">Common Mistakes to Avoid<\/h2>\n<ul data-start=\"3831\" data-end=\"3983\">\n<li data-section-id=\"d5at53\" data-start=\"3831\" data-end=\"3879\">\u274c Over-tuning without understanding workload<\/li>\n<li data-section-id=\"1kvqkwa\" data-start=\"3880\" data-end=\"3902\">\u274c Ignoring GC logs<\/li>\n<li data-section-id=\"5zhqrd\" data-start=\"3903\" data-end=\"3949\">\u274c Using default JVM settings in production<\/li>\n<li data-section-id=\"1thfp7a\" data-start=\"3950\" data-end=\"3983\">\u274c Not testing under peak load<\/li>\n<\/ul>\n<hr data-start=\"3985\" data-end=\"3988\" \/>\n<h2 data-section-id=\"mwf0n4\" data-start=\"3990\" data-end=\"4035\">Sample JVM Configuration for Low Latency<\/h2>\n<div class=\"relative w-full mt-4 mb-1\">\n<div class=\"\">\n<div class=\"relative\">\n<div class=\"h-full min-h-0 min-w-0\">\n<div class=\"h-full min-h-0 min-w-0\">\n<div class=\"border border-token-border-light border-radius-3xl corner-superellipse\/1.1 rounded-3xl\">\n<div class=\"h-full w-full border-radius-3xl bg-token-bg-elevated-secondary corner-superellipse\/1.1 overflow-clip rounded-3xl lxnfua_clipPathFallback\">\n<div class=\"pointer-events-none absolute inset-x-4 top-12 bottom-4\">\n<div class=\"pointer-events-none sticky z-40 shrink-0 z-1!\">\n<div class=\"sticky bg-token-border-light\"><\/div>\n<\/div>\n<\/div>\n<div class=\"w-full overflow-x-hidden overflow-y-auto\">\n<div class=\"relative z-0 flex max-w-full\">\n<div id=\"code-block-viewer\" dir=\"ltr\" class=\"q9tKkq_viewer cm-editor z-10 light:cm-light dark:cm-light flex h-full w-full flex-col items-stretch \u037c5 \u037cj\">\n<div class=\"cm-scroller\">\n<div class=\"cm-content q9tKkq_readonly\"><span class=\"\u037cf\">-server<\/span><br \/>\n<span class=\"\u037cf\">-Xms4g<\/span><br \/>\n<span class=\"\u037cf\">-Xmx4g<\/span><br \/>\n<span class=\"\u037cf\">-XX<\/span><span>:<\/span><span class=\"\u037c8\">+<\/span><span>UseZGC<\/span><br \/>\n<span class=\"\u037cf\">-XX<\/span><span>:<\/span><span class=\"\u037c8\">+<\/span><span>AlwaysPreTouch<\/span><br \/>\n<span class=\"\u037cf\">-XX<\/span><span>:<\/span><span class=\"\u037c8\">+<\/span><span>UnlockExperimentalVMOptions<\/span><br \/>\n<span class=\"\u037cf\">-XX<\/span><span>:<\/span><span class=\"\u037c8\">+<\/span><span>UseStringDeduplication<\/span><\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<div class=\"\">\n<div class=\"\"><\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<hr data-start=\"4165\" data-end=\"4168\" \/>\n<h2 data-section-id=\"1vw2tec\" data-start=\"4170\" data-end=\"4190\">Final Thoughts<\/h2>\n<p data-start=\"4192\" data-end=\"4315\">Achieving low latency in JVM applications is not about a single setting\u2014it\u2019s a <strong data-start=\"4271\" data-end=\"4304\">holistic optimization process<\/strong> involving:<\/p>\n<ul data-start=\"4317\" data-end=\"4400\">\n<li data-section-id=\"z6t3n0\" data-start=\"4317\" data-end=\"4331\">GC selection<\/li>\n<li data-section-id=\"1fvpa12\" data-start=\"4332\" data-end=\"4347\">Memory tuning<\/li>\n<li data-section-id=\"1c8bgmp\" data-start=\"4348\" data-end=\"4376\">Efficient coding practices<\/li>\n<li data-section-id=\"1nek7zd\" data-start=\"4377\" data-end=\"4400\">Continuous monitoring<\/li>\n<\/ul>\n<p data-start=\"4402\" data-end=\"4474\">The best results come from <strong data-start=\"4432\" data-end=\"4473\">iterative tuning + real-world testing<\/strong>.<\/p>\n<hr data-start=\"4476\" data-end=\"4479\" \/>\n<h1 data-section-id=\"ng6ogk\" data-start=\"4481\" data-end=\"4496\">References<\/h1>\n<ul data-start=\"4498\" data-end=\"4766\">\n<li data-section-id=\"1hal679\" data-start=\"4498\" data-end=\"4551\"><a data-start=\"4500\" data-end=\"4551\" rel=\"noopener\" target=\"_new\" class=\"decorated-link\" href=\"https:\/\/docs.oracle.com\/en\/java\/javase\/17\/gctuning\/\">https:\/\/docs.oracle.com\/en\/java\/javase\/17\/gctuning\/<span aria-hidden=\"true\" class=\"ms-0.5 inline-block align-middle leading-none\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20\" height=\"20\" aria-hidden=\"true\" data-rtl-flip=\"\" class=\"block h-[0.75em] w-[0.75em] stroke-current stroke-[0.75]\"><use href=\"\/cdn\/assets\/sprites-core-dd80ba6x.svg#304883\" fill=\"currentColor\"><\/use><\/svg><\/span><\/a><\/li>\n<li data-section-id=\"6cx3sb\" data-start=\"4552\" data-end=\"4587\"><a data-start=\"4554\" data-end=\"4587\" rel=\"noopener\" target=\"_new\" class=\"decorated-link\" href=\"https:\/\/openjdk.org\/projects\/zgc\/\">https:\/\/openjdk.org\/projects\/zgc\/<span aria-hidden=\"true\" class=\"ms-0.5 inline-block align-middle leading-none\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20\" height=\"20\" aria-hidden=\"true\" data-rtl-flip=\"\" class=\"block h-[0.75em] w-[0.75em] stroke-current stroke-[0.75]\"><use href=\"\/cdn\/assets\/sprites-core-dd80ba6x.svg#304883\" fill=\"currentColor\"><\/use><\/svg><\/span><\/a><\/li>\n<li data-section-id=\"kpn0fh\" data-start=\"4588\" data-end=\"4638\"><a data-start=\"4590\" data-end=\"4638\" rel=\"noopener\" target=\"_new\" class=\"decorated-link\" href=\"https:\/\/wiki.openjdk.org\/display\/shenandoah\/Main\">https:\/\/wiki.openjdk.org\/display\/shenandoah\/Main<span aria-hidden=\"true\" class=\"ms-0.5 inline-block align-middle leading-none\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20\" height=\"20\" aria-hidden=\"true\" data-rtl-flip=\"\" class=\"block h-[0.75em] w-[0.75em] stroke-current stroke-[0.75]\"><use href=\"\/cdn\/assets\/sprites-core-dd80ba6x.svg#304883\" fill=\"currentColor\"><\/use><\/svg><\/span><\/a><\/li>\n<li data-section-id=\"1k0yo1e\" data-start=\"4639\" data-end=\"4725\"><a data-start=\"4641\" data-end=\"4725\" rel=\"noopener\" target=\"_new\" class=\"decorated-link\" href=\"https:\/\/docs.oracle.com\/javase\/8\/docs\/technotes\/guides\/vm\/gctuning\/g1_gc_tuning.html\">https:\/\/docs.oracle.com\/javase\/8\/docs\/technotes\/guides\/vm\/gctuning\/g1_gc_tuning.html<span aria-hidden=\"true\" class=\"ms-0.5 inline-block align-middle leading-none\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20\" height=\"20\" aria-hidden=\"true\" data-rtl-flip=\"\" class=\"block h-[0.75em] w-[0.75em] stroke-current stroke-[0.75]\"><use href=\"\/cdn\/assets\/sprites-core-dd80ba6x.svg#304883\" fill=\"currentColor\"><\/use><\/svg><\/span><\/a><\/li>\n<li data-section-id=\"184q9k6\" data-start=\"4726\" data-end=\"4766\"><a data-start=\"4728\" data-end=\"4766\" rel=\"noopener\" target=\"_new\" class=\"decorated-link\" href=\"https:\/\/openjdk.java.net\/projects\/jmc\/\">https:\/\/openjdk.java.net\/projects\/jmc\/<span aria-hidden=\"true\" class=\"ms-0.5 inline-block align-middle leading-none\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20\" height=\"20\" aria-hidden=\"true\" data-rtl-flip=\"\" class=\"block h-[0.75em] w-[0.75em] stroke-current stroke-[0.75]\"><use href=\"\/cdn\/assets\/sprites-core-dd80ba6x.svg#304883\" fill=\"currentColor\"><\/use><\/svg><\/span><\/a><\/li>\n<\/ul>\n\n\n<p class=\"o-typing-delay-100ms ticss-27f7e3e9\"><o-anim-typing>&lt;> <strong>&#8220;Happy developing, one line at a time!&#8221;<\/strong> &lt;\/><\/o-anim-typing><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Modern applications\u2014from real-time trading systems to high-frequency APIs\u2014demand consistent low latency. While Java provides excellent performance, improper JVM tuning can introduce GC pauses, memory bottlenecks, and unpredictable latency spikes. This guide dives deep into practical JVM tuning strategies to help you achieve predictable, low-latency performance. Understanding Latency in JVM Applications [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":473,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_themeisle_gutenberg_block_has_review":false,"footnotes":"","jetpack_publicize_message":"Struggling with latency in your Java applications?\n\nI\u2019ve put together a practical guide on JVM tuning for low-latency systems\u2014covering GC selection, heap tuning, and real-world optimization strategies.\n\n#Java #JVM #Performance #Backend #SystemDesign #AWS #Microservices","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[113],"tags":[57,344,342,345,108,333,159,335,343,330],"class_list":["post-470","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-java-spring-boot-aws-microservices","tag-backend-optimization","tag-g1gc-tuning","tag-gc-tuning","tag-java-memory-optimization","tag-java-performance","tag-jvm-performance","tag-jvm-tuning","tag-low-latency-java","tag-shenandoah-gc","tag-zgc"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - 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