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New package: cache-calibrator
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The Calibrator is a small C program that is supposed to analyze
a computers (cache-) memory system and extract the following
parameters:

    number of cache levels
    for each cache level:
        its size
        its linesize
        its access/miss latency
    main memory access latency
    number of TLB levels
    for each TLB level:
        its capacity (i.e. number of entries)
        the pagesize used
        the TLB miss latency

http://homepages.cwi.nl/~manegold/Calibrator/

It is also recommended as a load generator for realtime testing in:

https://rt.wiki.kernel.org/index.php/RT_PREEMPT_HOWTO#Benchmarking

[Peter: reformat help text, fix extract step]
Signed-off-by: Stephan Hoffmann <sho@relinux.de>
Acked-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>
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@steho @jacmet
steho authored and jacmet committed Jan 29, 2013
1 parent 42169a4 commit 3c80d68
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1 change: 1 addition & 0 deletions package/Config.in
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Expand Up @@ -19,6 +19,7 @@ endmenu

menu "Debugging, profiling and benchmark"
source "package/bonnie/Config.in"
source "package/cache-calibrator/Config.in"
source "package/dhrystone/Config.in"
source "package/dstat/Config.in"
source "package/dmalloc/Config.in"
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13 changes: 13 additions & 0 deletions package/cache-calibrator/Config.in
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@@ -0,0 +1,13 @@
config BR2_PACKAGE_CACHE_CALIBRATOR
bool "cache-calibrator"
help
Cache calibrator is a small C program that is supposed to
analyze a computers (cache-) memory system and extract
useful information

http://homepages.cwi.nl/~manegold/Calibrator/

It is also recommended as a load generator for realtime
testing in:

https://rt.wiki.kernel.org/index.php/RT_PREEMPT_HOWTO
108 changes: 108 additions & 0 deletions package/cache-calibrator/cache-calibrator-Fix-conflicting-round-function.patch
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@@ -0,0 +1,108 @@
From 39ac7268c4350040976005da98daf10edf676d3e Mon Sep 17 00:00:00 2001
From: Stephan Hoffmann <sho@relinux.de>
Date: Mon, 28 Jan 2013 17:32:10 +0100
Subject: [PATCH] Fix conflicting round() function

calibrator.c defines a local round() function that conflicts
with the one from the standard library.

This is fixed by renaming the local function.

Signed-off-by: Stephan Hoffmann <sho@relinux.de>
---
calibrator.c | 30 +++++++++++++++---------------
1 files changed, 15 insertions(+), 15 deletions(-)

diff --git a/calibrator.c b/calibrator.c
index e045dfd..8471c04 100644
--- a/calibrator.c
+++ b/calibrator.c
@@ -128,7 +128,7 @@ void ErrXit(char *format, ...) {
exit(1);
}

-lng round(dbl x)
+lng lng_round(dbl x)
{
return (lng)(x + 0.5);
}
@@ -890,16 +890,16 @@ void plotCache(cacheInfo *cache, lng **result, lng MHz, char *fn, FILE *fp, lng
fprintf(fp, ")\n");
fprintf(fp, "set y2tics");
for (l = 0, s = " ("; l <= cache->levels; l++, s = ", ") {
- if (!delay) fprintf(fp, "%s'(%ld)' %f", s, round(CYperIt(cache->latency1[l] - delay)), NSperIt(cache->latency1[l] - delay));
- else fprintf(fp, "%s'(%ld)' %f", s, round(CYperIt(cache->latency2[l] - delay)), NSperIt(cache->latency2[l] - delay));
+ if (!delay) fprintf(fp, "%s'(%ld)' %f", s, lng_round(CYperIt(cache->latency1[l] - delay)), NSperIt(cache->latency1[l] - delay));
+ else fprintf(fp, "%s'(%ld)' %f", s, lng_round(CYperIt(cache->latency2[l] - delay)), NSperIt(cache->latency2[l] - delay));
}
for (y = 1; y <= yh; y *= 10) {
fprintf(fp, "%s'%1.3g' %ld", s, (dbl)(y * MHz) / 1000.0, y);
}
fprintf(fp, ")\n");
for (l = 0; l <= cache->levels; l++) {
- if (!delay) z = (dbl)round(CYperIt(cache->latency1[l] - delay)) * 1000.0 / (dbl)MHz;
- else z = (dbl)round(CYperIt(cache->latency2[l] - delay)) * 1000.0 / (dbl)MHz;
+ if (!delay) z = (dbl)lng_round(CYperIt(cache->latency1[l] - delay)) * 1000.0 / (dbl)MHz;
+ else z = (dbl)lng_round(CYperIt(cache->latency2[l] - delay)) * 1000.0 / (dbl)MHz;
fprintf(fp, "set label %ld '(%1.3g) ' at %f,%f right\n", l + 1, z, xl, z);
fprintf(fp, "set arrow %ld from %f,%f to %f,%f nohead lt 0\n", l + 1, xl, z, xh, z);
}
@@ -986,16 +986,16 @@ void plotTLB(TLBinfo *TLB, lng **result, lng MHz, char *fn, FILE *fp, lng delay)
fprintf(fp, "%s'<L1>' %ld)\n", s, TLB->mincachelines);
fprintf(fp, "set y2tics");
for (l = 0, s = " ("; l <= TLB->levels; l++, s = ", ") {
- if (!delay) fprintf(fp, "%s'(%ld)' %f", s, round(CYperIt(TLB->latency1[l] - delay)), NSperIt(TLB->latency1[l] - delay));
- else fprintf(fp, "%s'(%ld)' %f", s, round(CYperIt(TLB->latency2[l] - delay)), NSperIt(TLB->latency2[l] - delay));
+ if (!delay) fprintf(fp, "%s'(%ld)' %f", s, lng_round(CYperIt(TLB->latency1[l] - delay)), NSperIt(TLB->latency1[l] - delay));
+ else fprintf(fp, "%s'(%ld)' %f", s, lng_round(CYperIt(TLB->latency2[l] - delay)), NSperIt(TLB->latency2[l] - delay));
}
for (y = 1; y <= yh; y *= 10) {
fprintf(fp, "%s'%1.3g' %ld", s, (dbl)(y * MHz) / 1000.0, y);
}
fprintf(fp, ")\n");
for (l = 0; l <= TLB->levels; l++) {
- if (!delay) z = (dbl)round(CYperIt(TLB->latency1[l] - delay)) * 1000.0 / (dbl)MHz;
- else z = (dbl)round(CYperIt(TLB->latency2[l] - delay)) * 1000.0 / (dbl)MHz;
+ if (!delay) z = (dbl)lng_round(CYperIt(TLB->latency1[l] - delay)) * 1000.0 / (dbl)MHz;
+ else z = (dbl)lng_round(CYperIt(TLB->latency2[l] - delay)) * 1000.0 / (dbl)MHz;
fprintf(fp, "set label %ld '(%1.3g) ' at %f,%f right\n", l + 1, z, xl, z);
fprintf(fp, "set arrow %ld from %f,%f to %f,%f nohead lt 0\n", l + 1, xl, z, xh, z);
}
@@ -1023,9 +1023,9 @@ void printCPU(cacheInfo *cache, lng MHz, lng delay)
FILE *fp = stdout;

fprintf(fp, "CPU loop + L1 access: ");
- fprintf(fp, " %6.2f ns = %3ld cy\n", NSperIt(cache->latency1[0]), round(CYperIt(cache->latency1[0])));
+ fprintf(fp, " %6.2f ns = %3ld cy\n", NSperIt(cache->latency1[0]), lng_round(CYperIt(cache->latency1[0])));
fprintf(fp, " ( delay: ");
- fprintf(fp, " %6.2f ns = %3ld cy )\n", NSperIt(delay), round(CYperIt(delay)));
+ fprintf(fp, " %6.2f ns = %3ld cy )\n", NSperIt(delay), lng_round(CYperIt(delay)));
fprintf(fp, "\n");
fflush(fp);
}
@@ -1047,8 +1047,8 @@ void printCache(cacheInfo *cache, lng MHz)
fprintf(fp, " %3ld KB ", cache->size[l] / 1024);
}
fprintf(fp, " %3ld bytes ", cache->linesize[l + 1]);
- fprintf(fp, " %6.2f ns = %3ld cy " , NSperIt(cache->latency2[l + 1] - cache->latency2[l]), round(CYperIt(cache->latency2[l + 1] - cache->latency2[l])));
- fprintf(fp, " %6.2f ns = %3ld cy\n", NSperIt(cache->latency1[l + 1] - cache->latency1[l]), round(CYperIt(cache->latency1[l + 1] - cache->latency1[l])));
+ fprintf(fp, " %6.2f ns = %3ld cy " , NSperIt(cache->latency2[l + 1] - cache->latency2[l]), lng_round(CYperIt(cache->latency2[l + 1] - cache->latency2[l])));
+ fprintf(fp, " %6.2f ns = %3ld cy\n", NSperIt(cache->latency1[l + 1] - cache->latency1[l]), lng_round(CYperIt(cache->latency1[l + 1] - cache->latency1[l])));
}
fprintf(fp, "\n");
fflush(fp);
@@ -1075,9 +1075,9 @@ void printTLB(TLBinfo *TLB, lng MHz)
} else {
fprintf(fp, " %3ld KB ", TLB->pagesize[l + 1] / 1024);
}
- fprintf(fp, " %6.2f ns = %3ld cy ", NSperIt(TLB->latency2[l + 1] - TLB->latency2[l]), round(CYperIt(TLB->latency2[l + 1] - TLB->latency2[l])));
+ fprintf(fp, " %6.2f ns = %3ld cy ", NSperIt(TLB->latency2[l + 1] - TLB->latency2[l]), lng_round(CYperIt(TLB->latency2[l + 1] - TLB->latency2[l])));
/*
- fprintf(fp, " %6.2f ns = %3ld cy" , NSperIt(TLB->latency1[l + 1] - TLB->latency1[l]), round(CYperIt(TLB->latency1[l + 1] - TLB->latency1[l])));
+ fprintf(fp, " %6.2f ns = %3ld cy" , NSperIt(TLB->latency1[l + 1] - TLB->latency1[l]), lng_round(CYperIt(TLB->latency1[l + 1] - TLB->latency1[l])));
*/
fprintf(fp, "\n");
}
--
1.7.0.4

24 changes: 24 additions & 0 deletions package/cache-calibrator/cache-calibrator.mk
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@@ -0,0 +1,24 @@
#############################################################
#
# cache-calibrator
#
#############################################################

CACHE_CALIBRATOR_SOURCE = calibrator.c
CACHE_CALIBRATOR_SITE = http://homepages.cwi.nl/~manegold/Calibrator/src
CACHE_CALIBRATOR_LICENSE = Cache calibrator license
CACHE_CALIBRATOR_LICENSE_FILES = calibrator.c

define CACHE_CALIBRATOR_EXTRACT_CMDS
cp $(DL_DIR)/$(CACHE_CALIBRATOR_SOURCE) $(@D)
endef

define CACHE_CALIBRATOR_BUILD_CMDS
$(TARGET_CC) $(TARGET_CFLAGS) $(TARGET_LDFLAGS) $(@D)/calibrator.c -o $(@D)/cache_calibrator -lm
endef

define CACHE_CALIBRATOR_INSTALL_TARGET_CMDS
$(INSTALL) -D -m 0755 $(@D)/cache_calibrator $(TARGET_DIR)/usr/bin/cache_calibrator
endef

$(eval $(generic-package))

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