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Top Forums Programming Efficient logging of time measurements Post 302768797 by achenle on Saturday 9th of February 2013 05:32:28 PM
Old 02-09-2013
Quote:
Originally Posted by tamil.pamaran
achenle,

Thanks for quite detailed response.

I was thinking about a similar solution. Apart from getting logs in string format, syslogd process works in similar fashion. Which mandates lot of context switches between syslogd process and measured process.

I am thinking of creating a thread to do logging rather than a process, so as to reduce process context switch.

Any comments?

I decided to go with the binary structure.

Which one will be better to send measurements from measured thread to logging thread?
Shared memory with mutex or Non blocking messages(pipe,...)

/Tamil
Well, you'd probably wind up blocking on the mutex at times, while you should never block on the write.

Also, if you do your logging in a separate process, if there's a bug in it that causes a process crash (SEGV, etc), then you won't bring down your production process(s).

Compare that against the context switching needed for a separate process.

Without knowing your hardware and software, I can't really comment on which would be better for you and your processing.
 

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cachefslog(1M)															    cachefslog(1M)

NAME
cachefslog - Cache File System logging SYNOPSIS
logfile| cachefs_mount_point DESCRIPTION
The command is used to enable or disable logging for a cachefs_mount_point. When the command is used without any options, it displays the logfile. The logfile contains information on the operation performed on a cachefs_mount_point and statistics used by to get the working set size of cache directory. The specified logfile will contain information for all the CacheFS mount points using the same cache direc- tory. A logfile and a cache directory have a 1-to-1 mapping; that is, even if a cache directory is removed and recreated with the same name, the logfile used in the previous instance of the cache directory cannot be reused with the new cache directory. Enabling logging may have performance impact, even if minimal, on the operations for all the CacheFS mount points using the same cache directory. The command is mainly used for debugging purposes. Options The following options are supported. You must be a superuser to use the and options. Specify the logfile to be used. Halt logging. Operands cachefs_mount_point A mount point of a cache file system. RETURN VALUE
returns the following values: Success. non-zero An error occurred. EXAMPLES
1. Checking the logging of a directory. This example checks if the CacheFS file system is being logged: 2. Changing the logfile. This example changes the logfile of to 3. Verifying the change of a logfile. This example verifies the change of the previous example: 4. Halting the logging of a directory. This example halts logging for the directory: AUTHOR
was developed by Sun Microsystems, Inc. SEE ALSO
cachefsstat(1M), cachefswssize(1M), cfsadmin(1M). cachefslog(1M)
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