Here the benchmark of the dwarf cache.
Target program:
#include <sched.h>
int main(void)
{
unsigned int max = 0x6fff, i;
for (i = 0; i < max; i++)
sched_yield();
return 0;
}
Command line:
./strace -o /dev/null -k a.out
With the dwarf cache:
real 0m12.081s
user 0m3.858s
sys 0m8.194s
Without the dwarf cache:
real 0m22.326s
user 0m5.218s
sys 0m16.952s
Signed-off-by: Masatake YAMATO <[email protected]>
---
unwind.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/unwind.c b/unwind.c
index 0e90a92..036d0e4 100644
--- a/unwind.c
+++ b/unwind.c
@@ -88,6 +88,7 @@ unwind_init(void)
libunwind_as = unw_create_addr_space(&_UPT_accessors, 0);
if (!libunwind_as)
error_msg_and_die("failed to create address space for stack
tracing");
+ unw_set_caching_policy(libunwind_as, UNW_CACHE_GLOBAL);
}
void
@@ -139,6 +140,9 @@ build_mmap_cache(struct tcb* tcp)
size_t blen;
size_t dlen;
+ unw_flush_cache (libunwind_as, 0, 0);
+
+
sprintf(filename, "/proc/%d/maps", tcp->pid);
fp = fopen(filename, "r");
if (!fp) {
--
1.9.0
------------------------------------------------------------------------------
Learn Graph Databases - Download FREE O'Reilly Book
"Graph Databases" is the definitive new guide to graph databases and their
applications. Written by three acclaimed leaders in the field,
this first edition is now available. Download your free book today!
http://p.sf.net/sfu/NeoTech
_______________________________________________
Strace-devel mailing list
[email protected]
https://lists.sourceforge.net/lists/listinfo/strace-devel
