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Diffstat (limited to 'README')
| -rw-r--r-- | README | 12 |
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@@ -0,0 +1,12 @@ +== fmlock -- map a file into memory and lock it to RAM == + +fmlock is a small tool intended to load a file into the +block I/O cache and lock it there. This is done by mmap-ing +the whole file and calling mlock on the address space +occupied by the file. Then the program puts itself to sleep +until a signal arrives. The purpose of this is that (large) +files can be preloaded into RAM, specifically the block I/O +cache for other processes to read from. This is for example +required to measure the RAM bandwidth and CPU limited +throughput of data processing code, working on real data +without getting effected by I/O bottlenecks. |