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--- minixperformance [2014/11/11 14:52]
+++ minixperformance [2014/11/11 14:52] (current)
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+This page is to collect observations and experiments related to performance of minix.
+====== Starting point ======
+There are countless ways to talk about performance, so let's start with one simple case that is both relevant for our daily usage and displays terrible performance: gcc and clang on minix.
+====== Basic Observations ======
+  * Clang is significantly slower than gcc on minix, and it's supposed to be faster.
+  * There is high idle time when gcc and clang are executing, suggesting high i/o wait time
+====== Experiments ======
+(Timing measurements to be done.)
+  * Run with huge primary cache: no more idle time. clang is still significantly slower than gcc though, and gcc still isn't very fast.
+  * Run with /usr/tmp, /tmp and /usr/src on ramdisks: almost no idle time any more.
+  * Marking unreferenced blocks as clean if they're dirty: happens but doesn't help much in real time.
+  * Defer evicting dirty blocks from the cache, prefering a clean block even if it's older in order to batch write operations: helps with reducing flushall() calls but not much in real time.