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Re: benchmark and profiling


From: Diego Roversi
Subject: Re: benchmark and profiling
Date: Mon, 31 Dec 2001 18:14:29 +0100
User-agent: Mutt/1.2.5i

Hello,

  finally I succeded in profiling the ext2fs translator and I found the most
of the time is spent waiting for a lock.

Here the result of profiling a gnumach compile:

Flat profile:

Each sample counts as 0.0001 seconds.
  %   cumulative   self              self     total           
 time   seconds   seconds    calls  ps/call  ps/call  name    
 85.55      6.35     6.35                             file_pager_write_page 
(rwlock.h:52 @ 804e17e)
 12.82      7.30     0.95                             file_pager_write_page 
(pager.c:382 @ 804e190)
  0.27      7.32     0.02                             find_cache 
(name-cache.c:82 @ 8051503)
[...]

Note: line 382 of pager.c is the first line  after the call of
rwlock_reader_lock(). Note also that gprof report time scaled of 300 factor
(ie you can obtain real time multiply by 300).

BTW: for profiling ext2fs I made the following modification to fsys-goway.c
in libdiskfs:

--- fsys-goaway.c       Mon Dec 31 10:56:44 2001
+++ /gnu/src/hurd-20011105/libdiskfs/fsys-goaway.c      Tue Jun 27 01:30:14 1995
@@ -44,11 +44,7 @@
   if (ret == 0)
     {
       /* We are supposed to exit, but first notify the caller. */
-      printf("<<< exit >>>\n");
-      _mcleanup();
-      rename("gmon.out", "gmon.out2");
-      sleep(10);
-      fsys_goaway_reply (reply, reply_type, 0); 
+      fsys_goaway_reply (reply, reply_type, 0);
       exit (0);
     }
 
Probably the rename is not strictly necessary, btw before running gprof,
remember to rename back gmon.out to gmon.out. The _mcleanup() forces the
process to produce the gmon.out file.

That's all folk.

-- 
Saluti / Regards

Diego Roversi | diegor at maganet.net
              | diegor at tiscalinet.it 



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