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130 lines
3.6 KiB
Perl
Executable file
130 lines
3.6 KiB
Perl
Executable file
#!/usr/bin/perl -w
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# Sun JVM minor GC statistics. Parses a verbose log of minor GC
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# stats. Reads the log file and sums time in seconds spent on GC and
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# number of times it is performed. These numbers are saved in a state
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# file. The next time the plugin is run it only reads from the point
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# it quit the last time and increases the sums based on the lines
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# found in the last portion of the log. Thus we obtain counters. The
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# counters are reset when the log is rotated.
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# The two numbers are graphed in _one_ graph. Where it has been used
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# until now these two numbers have been in the same order of
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# magnitude.
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# Configuration (common with the other sun_jvm_* plugins in this family):
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# [jvm_sun_*]
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# env.logfile /var/foo/java.log (default: /var/log/munin/java.log)
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# env.graphtitle (default: "Sun Java")
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# env.grname (default: "sun-jvm". Used for state file-name)
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# You need to configure your Sun JVM with these options:
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# -verbose:gc
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# -Xloggc:/var/log/app/jvm/gc.log
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# -XX:+PrintGCTimeStamps
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# -XX:+PrintGCDetails
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# History:
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# This plugin was developed by various people over some time - no logs
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# of this has been found. - In 2006 significant contributions was
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# financed by NRK (Norwegian Broadcasting Coproration) and performed
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# by Nicolai Langfeldt of Linpro AS in Oslo, Norway.
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# $Id: $
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use strict;
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my $logfile = $ENV{logfile} || "/var/log/app/jvm/gc.log";
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my $grtitle = $ENV{graphtitle} || 'Sun Java';
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my $grname = $ENV{graphtitle} || 'sun-jvm';
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my $statefile = "/var/lib/munin/plugin-state/plugin-java_sun_${grname}_minorgcs.state";
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my $pos = 0;
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my $count = 0;
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my $seconds = 0;
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my $startsize;
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my $timespent;
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my $totaltimespent=0;
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if ( $ARGV[0] and $ARGV[0] eq "config" ) {
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print "graph_title $grtitle minor GCs pr minute\n";
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print "graph_args --base 1000 -l 0 --rigid\n";
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print "graph_scale no\n";
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print "graph_category Java\n";
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print "graph_period minute\n";
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print "gcs.label Number of GCs\n";
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print "gcs.type DERIVE\n";
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print "gcs.min 0\n";
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print "time.label Seconds spent on GC\n";
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print "time.type DERIVE\n";
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print "time.min 0\n";
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exit 0;
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}
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if (-l $statefile) {
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die("$statefile is a symbolic link, refusing to touch it.");
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}
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if (! -f $logfile) {
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print "gcs.value U\n";
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print "time.value U\n";
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exit 0;
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}
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if (-f "$statefile") {
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open (IN, "$statefile") or exit 4;
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($pos,$count,$timespent) = split(/:/,<IN>);
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close IN;
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}
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$startsize = (stat $logfile)[7];
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if ($startsize < $pos) {
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# Log rotated
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$pos = 0;
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}
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($pos, $count, $timespent) = parseFile ($logfile, $pos, $count, $timespent);
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print "gcs.value $count\n";
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print "time.value ",int($timespent),"\n";
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open (OUT, ">$statefile") or die "Could not open $statefile for reading: $!\n";
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print OUT "$pos:$count:$timespent\n";
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close OUT;
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sub parseFile {
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my ($fname, $start, $count, $timespent) = @_;
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my @secs;
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open (LOGFILE, $fname) or die "Could not open $fname: $!\n";
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# Stat filehandle after open - avoids race with logrotater or
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# restart or whatever.
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my $stop = $startsize = (stat LOGFILE)[7];
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if ($startsize < $start) {
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# Log rotated
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$start = 0;
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}
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seek (LOGFILE, $start, 0) or
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die "Could not seek to $start in $fname: $!\n";
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while (tell (LOGFILE) < $stop) {
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my $line =<LOGFILE>;
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chomp ($line);
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# Log format: 35.037: [GC 35.038: [DefNew: 166209K->11364K(174080K), 0.2106410 secs] 175274K->26037K(1721472K), 0.2107680 secs]
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if ($line =~ /\[GC.+ (\d+\.\d+) secs\]/) {
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$count++;
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$timespent += $1;
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}
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}
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close(LOGFILE);
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return($stop,$count,$timespent);
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}
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# vim:syntax=perl
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