memx(8) [ultrix man page]
memx(8) System Manager's Manual memx(8) Name memx - memory exerciser Syntax /usr/field/memx [ -h ] [ -s ] [ -ofile ] [ -ti ] [ -mj ] [ -pk ] Description The memory exerciser spawns processes to exercise memory by writing and reading three patterns: 1's and 0's, 0's and 1's, and a random pat- tern. You specify the number of processes to spawn and the size of memory to be tested by each process. The first process is a shared memory exerciser, the remaining are standard memory exercisers. The exerciser will run until the process receives a or a kill -15 pid. A logfile is made in for you to examine and then remove. If there are errors in the logfile, check the file, where the driver and kernel error messages are saved. Options The options are: -h Print the help message for the command. -s Disable shared memory testing. -ofile Save diagnostic output in file. -ti Run time in minutes (i). The default is to run until the process receives a or a kill -15 pid. -mj The memory size in bytes (j) to be tested by each spawned process. Must be greater than 4095. The default is (total-memory)/20. -pk The number of processes to spawn (k). The default is 20. The maximum is also 20. Restrictions The exerciser is restricted by the size of swap space available. The size of the swap space and the size of internal memory available will determine how many processes can run on the system. For example, If there were 16Mbytes of swap space and 16Mbytes of memory, all of the swap space would be used if all 20 spawned memory exercisers were running. In that event, no new processes would be able to run. On sys- tems with large amounts of memory and small swap space, you must restrict the number of memory exercisers and/or the size of memory being tested. If there is a 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 the target file system must be writable by root. Also the directory, in which any of the exer- cisers 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. Examples The following example tests all of memory by running 20 spawned processes until a or kill -15 pid is received. % /usr/field/memx The following example runs 10 spawned processes, memory size 500,000 bytes, for 180 minutes in the background. % /usr/field/memx -t180 -m500000 -p10 & See Also Guide to System Exercisers memx(8)
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memx(8) System Manager's Manual memx(8) NAME
memx - memory exerciser SYNOPSIS
/usr/field/memx -s [-h] [-ofile] [-ti] [-mj] [-pk] OPTIONS
The memx options are as follows: Print the help message for the memx command. Disables automatic shared memory testing. Save diagnostic output in file. Run time in minutes (i). The default is to run until the process receives a CTRL-C or a kill -15 pid command. The memory size in bytes (j) to be tested by each spawned process. Must be greater than 4095. The default is (total-memory)/20. The number of pro- cesses to spawn (k). The default is 20. The maximum is also 20. DESCRIPTION
The memx memory exerciser spawns processes to exercise memory by writing and reading three patterns: 1's and 0's, 0's and 1's, and a random pattern. You specify the number of processes to spawn and the size of memory to be tested by each process. If the shmx Shared Memory exerciser is present, it will be the first process spawned; the remaining processes are standard memory exercisers. The memx exerciser will run until the process receives a CTRL-C or a kill -15 pid command. A logfile for you to examine and then remove is created in the current working directory. If there are errors in the logfile, check the syslog file where the driver and kernel error messages are saved. RESTRICTIONS
The memx exerciser is restricted by the size of the available swap space. The size of the swap space and the size of internal memory available determines how many processes can run on the system. For example, If there is 16 Mbytes of swap space and 16 Mbytes of memory, all of the swap space would be used if all 20 spawned memory exercisers are running. In that event, no new processes would be able to run. On systems with large amounts of memory and small swap space, you must restrict the number of memory exercisers and/or the size of memory being tested. If there is a 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 in which any of 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. You should specify the -s option to disable automatic shared memory testing, which is not supported. EXAMPLES
The following example tests all of memory by running 20 spawned processes until a CTRL-C or kill -15 pid command is received: % /usr/field/memx The following example runs 10 spawned processes, memory size 500,000 bytes, for 180 minutes in the background. % /usr/field/memx -t180 -m500000 -p10 & SEE ALSO
Commands: cmx(8), diskx(8), fsx(8), shmx(8), tapex(8) memx(8)