On 11/03/16 at 03:28pm, Xunlei Pang wrote: [snip] > > For large trace data(tested on rhel7, the filter doesn't work on rhel7, and will produce huge trace data), > > the time consumption is huge, I am afraid in minutes because I once suspected the script was in some > > dead loop when parsing "tracing/trace" directly. It is the same situation when turning off tracing_on and > > try again. > > Although I don't know why, after I replaced the following scripts > 1) > while read pid cpu flags ts function > do > ... ... > done < "$TRACE_BASE/tracing/trace" > > with > > 2) > cat "$TRACE_BASE/tracing/trace" | while read pid cpu flags ts function > do > ... ... > done > > 2) became not time-consuming just like parsing the copied filename in 1) ... Maybe 1) read the sysfs file a lot of times, but 2) only once then parsing them in pipe which is quiker. It should be fine if 2) is acceptable, but if the data is very large it may worth to use some external program like awk which will be faster. Thanks Dave -- To unsubscribe from this list: send the line "unsubscribe initramfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
