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Improvements in XrdFileCache configuration #173

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merged 7 commits into from
Nov 21, 2014
Merged

Improvements in XrdFileCache configuration #173

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128330a
Use pfc prefix in config file to set XrdFileCacheOptions.
alja Nov 20, 2014
05c9bb0
Update configuration entry.
alja Nov 20, 2014
3b654ba
Make all options lowcase.
alja Nov 21, 2014
a3d69d5
Make all options lowcase.
alja Nov 21, 2014
2391e79
Rename buffersize to blocksize. Rename fileblockmode to filefragmentm…
alja Nov 21, 2014
bf2df4f
Use XrdSysError to print configuration status instead of XrdCl logger.
alja Nov 21, 2014
041ee21
Rename variable from m_blockSize to m_fileFragmentSize.
alja Nov 21, 2014
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37 changes: 19 additions & 18 deletions src/XrdFileCache/README
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Expand Up @@ -112,36 +112,37 @@ Partial file block-based prefetching is enabled with option '-prefetchFileBlock'

CONFIGURATION

-bufferSize: prefetch buffer size, default 1M
pfc.cachedir <directory>: directory path to cache location

-NRamBuffersRead: number of in memmory cached blocks reserved for read tasks
pfc.blocksize: prefetch buffer size, default 1M

-NRamBuffersRead: number of in memmory cached blocks reserved for prefetch tasks
pfc.nread: number of in memory cached blocks reserved for read tasks

-hwm <fraction> / -lwm <fraction>: high / low watermarks for disk cache purge
operation (default 0.7 and 0.9)
pfc.nprefetch: number of in memory cached blocks reserved for prefetch tasks

-cacheDir <directory>: directory path to cache location
pfc.diskusage <lwm fraction> <hwm fraction>: high / low watermarks for disk cache
purge operation (default 0.7 and 0.9)

-user <username>: username required by the XrdOss plugin
pfc.user <username>: username used by XrdOss plugin

pfc.filefragmentmode [fragmentsize <bytes>] -- enable prefetching a unit of a file,
with default block size

Options for block-based cache:
pfc.osslib <lpath> [<params>] path to alternative plign for output file system

-prefetchFileBlocks -- enable prefetching a unit of a file
pfc.decisionlib <lpath> [<prams>] path to decision library and plugin parameters

-blockSize <size>: default size of a file-block on the local disk
Examples

a) Enable proxy file prefetching:
pps.cachelib libXrdFileCache.so
pfc.cachedir /data/xrd-file-cache
pfc.nprefetch 1

Examples:

pss.cachelib /home/alja/xrd/hdfs/xfc/src/libXrdFileCache.so
-user alja -NRamBuffersRead 4M -NRamBuffersPrefetch 1 -cacheDir /data/xrd-file-cache


pss.cachelib /home/alja/xrd/hdfs/xfc/src/libXrdFileCache.so
-user alja -cacheDir /data/hdfs-file-cache
-prefetchFileBlocks -blockSize 64M
b) enable file block mode, with block size 64 MB:
pss.cachelib libXrdFileCache.so
pfc.filefragmentmode fragmentsize 64m


//==============================================================================
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