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104 lines
2.5 KiB
Text
Executable file
104 lines
2.5 KiB
Text
Executable file
#!/usr/bin/stap
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/*
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* Copyright (c) 2010 Oracle and/or its affiliates. All rights reserved.
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*
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* cache.stp - Display DB cache activity groups by file.
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*
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* The path to the DB library is required to be the first argument.
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*
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* usage:
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* cache <library-path> [<stap options, e.g. -x <pid>>] \
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* [interval [#iterations [warmup period]]]
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*
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* The defaults are
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* interval - 1 second
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* iterations - 0: unlimited)
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* warmup - 0: start measuring right away)
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*
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* For each 'interval' seconds display overall and per-file cache stats:
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* hits
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* misses
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* evictions
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* Empty lines are displayed when where was no cache activity for that
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* file & counter during that interval
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*/
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global interval, current, iterations;
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global warmup, hits, misses, evictions, secs, tick;
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probe begin
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{
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interval = 10;
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iterations = 60;
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warmup = 0;
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%( $# >= 2 %? interval = $2 %)
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%( $# >= 3 %? iterations = $3 %)
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%( $# >= 4 %? warmup = $4 %)
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secs = interval;
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tick = 0;
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current = 0;
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}
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function printstats()
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{
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foreach ([file+] in hits)
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printf("Hits for %s %d\n", file, @count(hits[file]));
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foreach ([file+] in misses)
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printf("Misses for %s %d\n", file, @count(misses[file]));
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foreach ([file+] in evictions)
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printf("Evictions for %s %d\n", file, @count(evictions[file]));
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delete hits;
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delete misses;
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delete evictions;
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}
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/* mpool-miss(unsigned misses, char *file, unsigned pgno)
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*/
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probe process(@1).mark("mpool__miss")
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{
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if (tick >= warmup)
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misses[$arg2 == 0 ? "<null>" : user_string($arg2)] <<< 1;
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}
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/* mpool-hit(unsigned hits, char *file, unsigned pgno) */
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probe process(@1).mark("mpool__hit")
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{
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if (tick >= warmup)
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hits[$arg2 == 0 ? "<null>" : user_string($arg2)] <<< 1;
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}
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/* mpool-evict(char *file, unsigned pgno, BH *buf */
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probe process(@1).mark("mpool__evict")
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{
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if (tick >= warmup)
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evictions[$arg1 == 0 ? "<null>" : user_string($arg1)] <<< 1;
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}
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probe timer.sec(1)
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{
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/* Print a banner when starting the first measurement interval. */
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if (tick == warmup) {
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printf("Cache info: %8s %8s %8s %sstarting @ %s\n", "hits",
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"misses", "evictions",
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iterations == 0 ? "" : sprintf("%d iterations ", iterations),
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ctime(gettimeofday_s()));
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secs = interval;
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}
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tick++;
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secs--;
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/* Display and erase statistics when ending an interval */
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if (secs == 0 && tick >= warmup) {
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printf(" %6d %8d %8d %8d\n", tick, hits, misses, evictions);
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hits = misses = evictions = 0;
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printstats();
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secs = interval;
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if (++current == iterations)
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exit();
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}
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}
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probe end
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{
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printf("\ncache.stp completed\n");
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}
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