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examples: add cache effectiveness stats to gencache.stp

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Signed-off-by: Ralph Boehme <slow@samba.org>
Reviewed-by: Stefan Metzmacher <metze@samba.org>

Autobuild-User(master): Ralph Böhme <slow@samba.org>
Autobuild-Date(master): Fri Aug 11 14:19:24 CEST 2017 on sn-devel-144
This commit is contained in:
Ralph Boehme 2017-07-26 14:29:33 +02:00
parent 62925cfa6e
commit b2f2ce0acc
1 changed files with 23 additions and 0 deletions
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23
examples/systemtap/gencache.stp
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@ -18,6 +18,7 @@
#
global running, intervals
global cache_misses, cache_hits, neg_cache_hits
probe begin {
printf("Collecting data, press ctrl-C to stop... ")
@ -37,6 +38,18 @@ probe process(@1).library("*").function("gencache_parse").return {
duration = end - begin
intervals["gencache_parse"] <<< duration
if ($return == 0) {
cache_misses++
} else {
cache_hits++
}
}
probe process(@1).library("*").function("gencache_get_data_blob_parser") {
if ($timeout == 0) {
neg_cache_hits++
}
}
probe process(@1).library("*").function("gencache_get_data_blob") {
@ -106,6 +119,16 @@ probe process(@1).library("*").function("gencache_stabilize").return {
probe end {
printf("\n\n")
printf("Summary of cache access stats\n")
printf("=============================\n\n")
printf("%-10s %-10s %-10s\n",
"Hits", "Misses", "Negative-Hits");
printf("--------------------------------------\n")
printf("%-10d %-10d %-10d\n",
cache_hits, cache_misses, neg_cache_hits);
printf("\n")
foreach ([name] in intervals) {
printf("%-30s count: %d sum: %d us (min: %d us avg: %d us max: %d us)\n",
name,