Hello monks,

I am using Log::Log4perl as logger in my fastcgi based web application (in apache on WinXP). There is multiple processes with same code, so all pieces is writing to same log file. I wondered if it is a problem, so made simple test: 

use Log::Log4perl qw(:easy);

Log::Log4perl->init(\ qq{
    log4perl.logger=DEBUG, A1
    log4perl.appender.A1          = Log::Log4perl::Appender::File
    log4perl.appender.A1.filename = test2.log
    log4perl.appender.A1.syswrite = 1
    log4perl.appender.A1.layout   = SimpleLayout
});

my $id = shift;

for (1..20) {
    DEBUG "tick $_ from $id";
    sleep(1);
}

[download]

The script above (in file log_test.pl) is runned ten times with xargs like this 

perl -E "say for 1..10" | xargs -n 1 -P 10 perl log_test.pl

[download]

Log file should contain 20 ticks from 10 processes 

...
DEBUG - tick 1 from 4
DEBUG - tick 1 from 5
DEBUG - tick 2 from 9
DEBUG - tick 2 from 10
...

[download]

Unfortunately, there few entries missing. Typically it is like 5-10 entries out of 200 expected. I tried to enable/disable syswrite option, but it end up with similar results. I also tried to use Log::Log4perl::Appender::Synchronized, but it seems that IPC::SysV it is using does not work on Windows.

Any idea for better approach/solution?

-- thanks, Roman

In reply to Multiple processes using Log::Log4perl to write into single log by bobr

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