Hi, I've read that BTS tracing induces ~20% overhead, but when using an extremely stripped down version of the bts_smpl code provided in libpfm4, the overhead is much more than this. On a test run of bzip2, bts_smpl took 403 seconds whereas a normal run takes only 16.6 seconds. In that test, I even fully removed the call to process_smpl_buf in the main loop. I am using 2.6.32-rc7 with the most recent libpfm tree. Am I going about gathering BTS information the wrong way or is it inherently this slow to access?
Thanks so much in advance for your suggestions and help. - Kristen
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