perf-diff(1) ============ NAME ---- perf-diff - Read two perf.data files and display the differential profile SYNOPSIS -------- [verse] 'perf diff' [oldfile] [newfile] DESCRIPTION ----------- This command displays the performance difference amongst two perf.data files captured via perf record. If no parameters are passed it will assume perf.data.old and perf.data. The differential profile is displayed only for events matching both specified perf.data files. OPTIONS ------- -M:: --displacement:: Show position displacement relative to baseline. -D:: --dump-raw-trace:: Dump raw trace in ASCII. -m:: --modules:: Load module symbols. WARNING: use only with -k and LIVE kernel -d:: --dsos=:: Only consider symbols in these dsos. CSV that understands file://filename entries. -C:: --comms=:: Only consider symbols in these comms. CSV that understands file://filename entries. -S:: --symbols=:: Only consider these symbols. CSV that understands file://filename entries. -s:: --sort=:: Sort by key(s): pid, comm, dso, symbol. -t:: --field-separator=:: Use a special separator character and don't pad with spaces, replacing all occurrences of this separator in symbol names (and other output) with a '.' character, that thus it's the only non valid separator. -v:: --verbose:: Be verbose, for instance, show the raw counts in addition to the diff. -f:: --force:: Don't complain, do it. --symfs=:: Look for files with symbols relative to this directory. -b:: --baseline-only:: Show only items with match in baseline. -c:: --compute:: Differential computation selection - delta,ratio,wdiff (default is delta). If '+' is specified as a first character, the output is sorted based on the computation results. See COMPARISON METHODS section for more info. COMPARISON METHODS ------------------ delta ~~~~~ If specified the 'Delta' column is displayed with value 'd' computed as: d = A->period_percent - B->period_percent with: - A/B being matching hist entry from first/second file specified (or perf.data/perf.data.old) respectively. - period_percent being the % of the hist entry period value within single data file ratio ~~~~~ If specified the 'Ratio' column is displayed with value 'r' computed as: r = A->period / B->period with: - A/B being matching hist entry from first/second file specified (or perf.data/perf.data.old) respectively. - period being the hist entry period value wdiff ~~~~~ If specified the 'Weighted diff' column is displayed with value 'd' computed as: d = B->period * WEIGHT-A - A->period * WEIGHT-B - A/B being matching hist entry from first/second file specified (or perf.data/perf.data.old) respectively. - period being the hist entry period value - WEIGHT-A/WEIGHT-B being user suplied weights in the the '-c' option behind ':' separator like '-c wdiff:1,2'. SEE ALSO -------- linkperf:perf-record[1]