Hello Arun,
Thanks for the patch.
I made made some changes to tthe examples. They both had problems
reading the 2 events. See the attached updated versions.
Also I have added some code to catch error especially on pfm_load_context.
This work well now. However, I am having problems catching the libpfm errors.
I would rather have the exception called libpfmError. I modified perfmon_int.i
for that but it did not work. How do you do that. I would also like to be able
to called pfmlib_strerror() to print the error message if necessary.
Do you know how to do that?
Thanks.
On Mon, Mar 24, 2008 at 7:02 PM, Arun Sharma <[EMAIL PROTECTED]> wrote:
> Hi Stephane,
>
> I believe this updated patch handles exceptions better. I think I now
> understand the distinction between libpfm errors and os errors you
> were trying to make.
>
> # python -c "import perfmon; perfmon.pfm_dispatch_events(None, None,
> None, None)"
> Traceback (most recent call last):
> File "<string>", line 1, in ?
> perfmon.ERROR: (-3, 'pfmlib not initialized')
>
> # python -c "import perfmon; perfmon.pfm_start(1, None)"
> Traceback (most recent call last):
> File "<string>", line 1, in ?
> OSError: [Errno 9] Bad file descriptor
>
> This replaces all the other python related patches I've posted to the
> list so far.
>
> -Arun
>
> PS: The strings os_err_t, pfm_err_t don't matter. We could rename them
> to something else if you like.
>
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>
#!/usr/bin/env python
#
# Copyright (c) 2008 Google, Inc.
# Contributed by Arun Sharma <[EMAIL PROTECTED]>
#
# Permission is hereby granted, free of charge, to any person obtaining a
# copy of this software and associated documentation files (the "Software"),
# to deal in the Software without restriction, including without limitation
# the rights to use, copy, modify, merge, publish, distribute, sublicense,
# and/or sell copies of the Software, and to permit persons to whom the
# Software is furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included
# in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
# THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
# OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
# ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
# OTHER DEALINGS IN THE SOFTWARE.
#
# Self monitoring example. Copied from self.c
import os
from optparse import OptionParser
import random
import errno
from perfmon import *
if __name__ == '__main__':
parser = OptionParser()
parser.add_option("-p", "--pid", help="Monitor this process id", action="store", dest="pid")
parser.set_defaults(pid=os.getpid())
(options, args) = parser.parse_args()
# initialize library
opts = pfmlib_options_t()
opts.pfm_verbose = 1
pfm_set_options(opts)
pfm_initialize()
# setup context
ctx = pfarg_ctx_t()
fd = pfm_create_context(ctx, None, None, 0)
# select and dispatch events
inp = pfmlib_input_param_t()
pfm_get_cycle_event(inp.pfp_events[0])
pfm_get_inst_retired_event(inp.pfp_events[1])
# monitor at priv level 3 (user)
inp.pfp_dfl_plm = PFM_PLM3|PFM_PLM2
outp = pfmlib_output_param_t()
# measuring two events
cnt = 2
inp.pfp_event_count = cnt
# get assignment from libpfm
try:
pfm_dispatch_events(inp, None, outp, None)
except libpfm.ERROR:
print "dispatch failed"
# pfp_pmc_count may be > cnt
cnt = outp.pfp_pmc_count
pmcs = pmc(outp.pfp_pmc_count)
pmds = pmd(outp.pfp_pmd_count)
# copy pmc configuration
for i in xrange(outp.pfp_pmc_count):
# This code is a bit icky.
# pmcs[i].reg_num = x doesn't work
# Consult with SWIG experts
npmc = pfarg_pmc_t()
npmc.reg_num = outp.pfp_pmcs[i].reg_num
npmc.reg_value = outp.pfp_pmcs[i].reg_value
pmcs[i] = npmc
# copy pmd configuration
for i in xrange(outp.pfp_pmd_count):
npmd = pfarg_pmd_t()
npmd.reg_num = outp.pfp_pmds[i].reg_num
pmds[i] = npmd
# program PMCs and PMDs
pfm_write_pmcs(fd, pmcs, outp.pfp_pmc_count)
pfm_write_pmds(fd, pmds, outp.pfp_pmd_count)
# attach context to self
load = pfarg_load_t()
load.load_pid = int(options.pid)
try:
pfm_load_context(fd, load)
except OSError, err:
if err.errno == errno.EBUSY:
print "There is a conflicting system-wide session"
else:
print "pfm_load_context failed:", os.strerror(err.errno)
os.close(fd)
os._exit(1)
# Start measuring
pfm_start(fd, None)
# code to be measured
#
# note that this is not identical to what examples/self.c does
# thus counts will be different in the end
for i in range(1, 10000000):
random.random()
# stop monitoring
pfm_stop(fd)
# read counts
pfm_read_pmds(fd, pmds, outp.pfp_pmd_count)
# print the counts
for i in xrange(outp.pfp_pmd_count):
print """PMD%d\t%lu""" % (pmds[i].reg_num, pmds[i].reg_value)
os.close(fd)
#!/usr/bin/env python
#
# Copyright (c) 2008 Google, Inc.
# Contributed by Arun Sharma <[EMAIL PROTECTED]>
#
# Permission is hereby granted, free of charge, to any person obtaining a
# copy of this software and associated documentation files (the "Software"),
# to deal in the Software without restriction, including without limitation
# the rights to use, copy, modify, merge, publish, distribute, sublicense,
# and/or sell copies of the Software, and to permit persons to whom the
# Software is furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included
# in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
# THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
# OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
# ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
# OTHER DEALINGS IN THE SOFTWARE.
#
# System wide monitoring example. Copied from syst.c
#
# Prints the CPI (cycles per instruction) on a given cpu
# Run as: taskset -c cpu ./sys.py -c cpu
import os
from optparse import OptionParser
import random
import time
import errno
from perfmon import *
if __name__ == '__main__':
parser = OptionParser()
parser.add_option("-c", "--cpu", help="Monitor this cpu", action="store", dest="cpu")
parser.set_defaults(cpu=0)
(options, args) = parser.parse_args()
# initialize library
opts = pfmlib_options_t()
opts.pfm_verbose = 1
pfm_set_options(opts)
pfm_initialize()
# setup context as system-wide, i.e., cpu-wide
ctx = pfarg_ctx_t()
ctx.zero()
ctx.ctx_flags = PFM_FL_SYSTEM_WIDE
try:
fd = pfm_create_context(ctx, None, None, 0)
except OSError:
print "cannot create context, exiting"
os._exit(1)
# select and dispatch events
inp = pfmlib_input_param_t()
pfm_get_cycle_event(inp.pfp_events[0])
pfm_get_inst_retired_event(inp.pfp_events[1])
# measure user + kernel
inp.pfp_dfl_plm = PFM_PLM3 | PFM_PLM0
inp.pfp_flags = PFMLIB_PFP_SYSTEMWIDE;
outp = pfmlib_output_param_t()
cnt = 2
inp.pfp_event_count = cnt
# get assignment from libpfm
pfm_dispatch_events(inp, None, outp, None)
# pfp_pm_count may be > cnt
cnt = outp.pfp_pmc_count
pmcs = pmc(outp.pfp_pmc_count)
pmds = pmd(outp.pfp_pmd_count)
# copy PMC configuration
for i in xrange(outp.pfp_pmc_count):
# This code is a bit icky.
# pmcs[i].reg_num = x doesn't work
# Consult with SWIG experts
npmc = pfarg_pmc_t()
npmc.reg_num = outp.pfp_pmcs[i].reg_num
npmc.reg_value = outp.pfp_pmcs[i].reg_value
pmcs[i] = npmc
# copy the PMD configuration
for i in xrange(outp.pfp_pmd_count):
npmd = pfarg_pmd_t()
npmd.reg_num = outp.pfp_pmds[i].reg_num
pmds[i] = npmd
# program PMCs and PMDs
pfm_write_pmcs(fd, pmcs, outp.pfp_pmc_count)
pfm_write_pmds(fd, pmds, outp.pfp_pmd_count)
# attach to CPU
# process must run on CPU being measured
# perfmon does not change affinity. Given that
# in Python there is no affinity call, the program
# must be invoked via taskset -c XX if option --cpu
# is set to X. pfm_load_context fails if not running
# on the CPU to monitor
#
load = pfarg_load_t()
load.zero()
load.load_pid = int(options.cpu)
try:
pfm_load_context(fd, load)
except OSError, err:
if err.errno == errno.EBUSY:
print "There is a conflicting session"
elif err.errno == errno.EINVAL:
print """trying to monitor on CPU%s, but likely running on another, trying using taskset -c %s""" % (options.cpu, options.cpu)
else:
print "pfm_load_context failed:", os.strerror(err.errno)
os.close(fd)
os._exit(1)
# Measuring loop
print "Printing CPI"
for i in range(1, 10):
pfm_start(fd, None)
time.sleep(1)
pfm_stop(fd)
pfm_read_pmds(fd, pmds, outp.pfp_pmd_count)
# Print the counts
#for i in xrange(cnt):
# print pmds[i].reg_value,
print 1.0 * pmds[0].reg_value/pmds[1].reg_value
os.close(fd)
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Defy all challenges. Microsoft(R) Visual Studio 2008.
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