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JuiceFS has a special virtual file named .accesslog
to track every operation occurred within its client. This file may generate thousands of log entries per second when under pressure, making it hard to find out what is actually going on at a certain time. Thus, we made a simple tool called juicefs profile
to show an overview of recently completed operations. The basic idea is to aggregate all logs in the past interval and display statistics periodically, like:
For now there are 2 modes of profiling: real time and replay.
By executing the following command you can watch real time operations under the mount point:
$ juicefs profile MOUNTPOINT
The result is sorted in a descending order by number.
Running the profile command on an existing log file enables the replay mode:
$ juicefs profile LOGFILE
When debugging or analyzing perfomance issues, it is usually more practical to record access log first and then replay it(multiple times). For example:
$ cat /jfs/.accesslog > /tmp/jfs-oplog
# later
$ juicefs profile /tmp/jfs-oplog
The replay could be paused anytime by enter/return, and continues by pressing it again.
Sometimes we are only interested in a certain user or process, then we can filter others out by specifying its IDs; e.g:
$ juicefs profile /tmp/jfs-oplog --uid 12345
For more information, please run juicefs profile -h
.
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