site_archiver@lists.apple.com Delivered-To: darwin-dev@lists.apple.com Here's the scenario: After doing this, I quit the process calling printf. Logs may get lost . Real Memory (in Activity Monitor) can goes up as much as 860 MB. ---------------------------------------------------------------------------------- Total number in stack (recursive counted multiple, when >=5): Sort by top of stack, same collapsed (when >= 5): semaphore_wait_signal_trap 4930 mach_msg_trap 2465 asl_store_compact 2043 asl_store_truncate 342 read 38 write$NOCANCEL$UNIX2003 18 lseek 10 Sample analysis of process 928 written to file /dev/stdout _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev@lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.appl... Is the following case a performance issue with syslogd on Mac OS X 10.5.5? I'm dumping a byte buffer (which weights 4.7 MB approximately) into stdout using printf calls. The output looks like the one of hexdump - C. There's a '\n' for each new line. This may be done multiple times. syslogd then eats 100% of CPU and does not seem to want to stop but will after quite a while (more than 5 minutes). In the meantime Console.app is not responding and if it's launched, it does not refresh the Console Messages contents. Time to create new shell window in Terminal.app is bigger than usual. It takes 5-6 seconds. The size of /var/log/asl.db may change or not while syslogd is using 100% CPU. If I run a sample on syslogd, it shows that it's either asl_store_save or asl_store_compact that are taking 99.x% of CPU Time. Sampling process 928 for 3 seconds with 1 millisecond of run time between samples Sampling completed, processing symbols... Analysis of sampling syslogd (pid 928) every 1 millisecond Call graph: 2465 Thread_2503 2465 start 2465 main 2465 klog_in_close 2465 db_archive 2465 asl_store_truncate 2123 asl_store_open 2108 asl_store_compact 1622 asl_store_compact 1576 asl_store_compact 27 fread 27 __srefill 26 read 26 read 1 __srefill 16 fseek 15 _fseeko 8 __sflush 8 write$NOCANCEL$UNIX2003 8 write$NOCANCEL$UNIX2003 6 lseek 6 lseek 1 __bzero 1 __bzero 1 flockfile 1 __spin_lock 1 __spin_lock 3 fwrite$UNIX2003 3 __sfvwrite 3 __sfvwrite 467 asl_store_compact 13 fseek 11 _fseeko 6 __sflush 6 write$NOCANCEL$UNIX2003 6 write$NOCANCEL$UNIX2003 4 lseek 4 lseek 1 _sseek 1 _sseek 1 flockfile 1 __spin_lock 1 __spin_lock 1 funlockfile 1 funlockfile 6 fread 6 __srefill 6 read 6 read 15 asl_store_open 15 asl_store_open 8 fread 7 __srefill 6 read 6 read 1 _sread 1 _sread 1 __memcpy 1 __memcpy 6 fseek 6 _fseeko 4 __sflush 4 write$NOCANCEL$UNIX2003 4 write$NOCANCEL$UNIX2003 1 __bzero 1 __bzero 1 _fseeko 1 asl_store_open 342 asl_store_truncate 2465 Thread_2603 2465 thread_start 2465 _pthread_start 2465 database_server 2465 asl_ipc_server 2465 asl_ipc_server_routine 2465 __asl_server_query 2465 db_query 2465 pthread_mutex_lock 2465 semaphore_wait_signal_trap 2465 semaphore_wait_signal_trap 2465 Thread_2703 2465 thread_start 2465 _pthread_start 2465 db_worker 2465 pthread_mutex_lock 2465 semaphore_wait_signal_trap 2465 semaphore_wait_signal_trap 2465 Thread_2803 2465 thread_start 2465 _pthread_start 2465 launchd_drain 2465 _vprocmgr_log_drain 2465 vproc_mig_log_drain 2465 mach_msg 2465 mach_msg_trap 2465 mach_msg_trap This email sent to site_archiver@lists.apple.com