From bf8d6a109200bf10f1c942ad914aa8cb5f279e17 Mon Sep 17 00:00:00 2001 From: Jason Evans Date: Wed, 15 Oct 2014 16:18:42 -0700 Subject: Add small run utilization to stats output. Add the 'util' column, which reports the proportion of available regions that are currently in use for each small size class. Small run utilization is the complement of external fragmentation. For example, utilization of 0.75 indicates that 25% of small run memory is consumed by external fragmentation, in other (more obtuse) words, 33% external fragmentation overhead. This resolves #27. --- src/stats.c | 50 ++++++++++++++++++++++++++++++++++---------------- 1 file changed, 34 insertions(+), 16 deletions(-) diff --git a/src/stats.c b/src/stats.c index 16a18c5..054f033 100644 --- a/src/stats.c +++ b/src/stats.c @@ -69,14 +69,14 @@ stats_arena_bins_print(void (*write_cb)(void *, const char *), void *cbopaque, if (config_tcache) { malloc_cprintf(write_cb, cbopaque, "bins: size ind allocated nmalloc" - " ndalloc nrequests curregs regs pgs" - " nfills nflushes newruns reruns" - " curruns\n"); + " ndalloc nrequests curregs curruns regs" + " pgs util nfills nflushes newruns" + " reruns\n"); } else { malloc_cprintf(write_cb, cbopaque, "bins: size ind allocated nmalloc" - " ndalloc nrequests curregs regs pgs" - " newruns reruns curruns\n"); + " ndalloc nrequests curregs curruns regs" + " pgs util newruns reruns\n"); } CTL_GET("arenas.nbins", &nbins, unsigned); for (j = 0, in_gap = false; j < nbins; j++) { @@ -86,11 +86,12 @@ stats_arena_bins_print(void (*write_cb)(void *, const char *), void *cbopaque, if (nruns == 0) in_gap = true; else { - size_t reg_size, run_size, curregs; + size_t reg_size, run_size, curregs, availregs, milli; + size_t curruns; uint32_t nregs; uint64_t nmalloc, ndalloc, nrequests, nfills, nflushes; uint64_t reruns; - size_t curruns; + char util[6]; /* "x.yyy". */ if (in_gap) { malloc_cprintf(write_cb, cbopaque, @@ -118,24 +119,41 @@ stats_arena_bins_print(void (*write_cb)(void *, const char *), void *cbopaque, uint64_t); CTL_IJ_GET("stats.arenas.0.bins.0.curruns", &curruns, size_t); + + availregs = nregs * curruns; + milli = (availregs != 0) ? (1000 * curregs) / availregs + : 1000; + assert(milli <= 1000); + if (milli < 10) { + malloc_snprintf(util, sizeof(util), "0.00%zu", + milli); + } else if (milli < 100) { + malloc_snprintf(util, sizeof(util), "0.0%zu", + milli); + } else if (milli < 1000) { + malloc_snprintf(util, sizeof(util), "0.%zu", + milli); + } else + malloc_snprintf(util, sizeof(util), "1"); + if (config_tcache) { malloc_cprintf(write_cb, cbopaque, "%20zu %3u %12zu %12"PRIu64" %12"PRIu64 - " %12"PRIu64" %12zu %4u %3zu %12"PRIu64 + " %12"PRIu64" %12zu %12zu %4u %3zu %-5s" " %12"PRIu64" %12"PRIu64" %12"PRIu64 - " %12zu\n", + " %12"PRIu64"\n", reg_size, j, curregs * reg_size, nmalloc, - ndalloc, nrequests, curregs, nregs, run_size - / page, nfills, nflushes, nruns, reruns, - curruns); + ndalloc, nrequests, curregs, curruns, nregs, + run_size / page, util, nfills, nflushes, + nruns, reruns); } else { malloc_cprintf(write_cb, cbopaque, "%20zu %3u %12zu %12"PRIu64" %12"PRIu64 - " %12"PRIu64" %12zu %4u %3zu %12"PRIu64 - " %12"PRIu64" %12zu\n", + " %12"PRIu64" %12zu %12zu %4u %3zu %-5s" + " %12"PRIu64" %12"PRIu64"\n", reg_size, j, curregs * reg_size, nmalloc, - ndalloc, nrequests, curregs, nregs, - run_size / page, nruns, reruns, curruns); + ndalloc, nrequests, curregs, curruns, nregs, + run_size / page, util, nruns, reruns); } } } -- cgit v0.12