/usr/field/shmx [ -h ] [ -ofile ] [ -ttime ] [ -msize ] [ -ssegment ] [ -v ]
The shmx memory exerciser spawns the background process shmxb, and these two processes exercise the shared memory segments. They alternate writing and reading the other process' data in the segments.
You can specify the number of memory segments to test and the size of the segment to be tested by shmx and shmxb processes. The shmx exerciser runs until the process is killed.
A log file for you to examine and then remove is created in the current working directory. If there are errors in the logfile, check the syslog files where the driver and kernel error messages are saved. The shmx exerciser is automatically invoked when the memx exerciser is started. You can also invoke shmx manually.
You can use the following options:
If you need to run a system exerciser over an NFS link or on a diskless system, there are some restrictions. For exercisers that need to write into a file system, such as fsx(8), the target file system must be writable by root. Also the directory from which the exercisers are executed must be writable by root because temporary files are written into the current directory. These latter restrictions are sometimes difficult to overcome because often NFS file systems are mounted in a way that prevents root from writing into them. Some of the restrictions may be overcome by copying the exerciser to another directory and then executing it.
The following example tests the default number of memory segments (3), each with the default segment size (SHMMAX/SHMSEG): % /usr/field/shmx & The following example runs two memory segments of size 100,000 bytes for 180 minutes: % /usr/field/shmx -t180 -m100000 -s2 &
cmx(8), fsx(8), memx(8), tapex(8), diskx(8) delim off