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[Bug testsuite/10671] semok/twenty.stp takes 15 minutes on slow/low-memorry machine
- From: "fche at redhat dot com" <sourceware-bugzilla at sourceware dot org>
- To: systemtap at sources dot redhat dot com
- Date: 20 Sep 2009 23:33:39 -0000
- Subject: [Bug testsuite/10671] semok/twenty.stp takes 15 minutes on slow/low-memorry machine
- References: <20090920165213.10671.mjw@redhat.com>
- Reply-to: sourceware-bugzilla at sourceware dot org
------- Additional Comments From fche at redhat dot com 2009-09-20 23:33 -------
One possibility for pass-2 speedup is to clear out the various dwarf data
periodically by calling build_no_more if we detect we are paging.
On my tests, on a well-RAM'd machine, the bulk of the time is in fact in
pass 3 - the unwindsyms data dumping. That shouldn't be.
/usr/bin/time ./stap -r 2.6.30.5-43.fc11.x86_64 -e 'probe
module("*").function("*") {}' -t -p4 -v
Pass 1: parsed user script and 59 library script(s) in 100usr/10sys/181real ms.
Pass 2: analyzed script: 269484 probe(s), 0 function(s), 0 embed(s), 0 global(s)
in 8740usr/2800sys/62297real ms.
Pass 3: translated to C into
"/var/tmp/stapjsYUU9/stap_8924a4d5711146589d48a4be4e629fe1_39304877.c" in
396730usr/5350sys/746939real ms.
Pass 4: compiled C into "stap_8924a4d5711146589d48a4be4e629fe1_39304877.ko" in
28320usr/3590sys/46712real ms.
434.92user 12.29system 14:19.43elapsed 52%CPU (0avgtext+0avgdata 0maxresident)k
3043496inputs+854280outputs (22244major+1375284minor)pagefaults 0swaps
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