1PMDAZSWAP(1)                General Commands Manual               PMDAZSWAP(1)
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NAME

6       pmdazswap - zswap (compressed swap) PMDA
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DESCRIPTION

9       pmdazswap  is  a  Performance Metrics Domain Agent (PMDA) which exports
10       metric values about compressed swap operation, as tracked by the  zswap
11       Linux kernel module.
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13       Zswap is a lightweight compressed cache for swap pages.  It takes pages
14       that are in the process of being swapped out and attempts  to  compress
15       them  into a dynamically allocated RAM-based memory pool.  Zswap trades
16       CPU cycles for potentially reduced swap I/O.  This  tradeoff  can  also
17       result  in a performance improvement if reads from the compressed cache
18       are faster than reads from a swap device.
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20       This PMDA exports metrics about pool size, number of pages stored,  and
21       various counters for the reasons pages are rejected.
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INSTALLATION

24       Install the zswap PMDA by using the Install script as root:
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26           # cd $PCP_PMDAS_DIR/zswap
27           # ./Install
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30       To uninstall, do the following as root:
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32           # cd $PCP_PMDAS_DIR/zswap
33           # ./Remove
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35       pmdazswap is launched by pmcd(1) and should never be executed directly.
36       The Install and  Remove  scripts  notify  pmcd(1)  when  the  agent  is
37       installed or removed.
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FILES

40       $PCP_PMDAS_DIR/zswap/Install
41           installation script for the pmdazswap agent
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43       $PCP_PMDAS_DIR/zswap/Remove
44           undo installation script for the pmdazswap agent
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46       $PCP_LOG_DIR/pmcd/zswap.log
47           default log file for error messages from pmdazswap
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PCP ENVIRONMENT

50       Environment variables with the prefix PCP_ are used to parameterize the
51       file and directory names used by PCP. On each  installation,  the  file
52       /etc/pcp.conf  contains  the  local  values  for  these variables.  The
53       $PCP_CONF variable may be used to specify an alternative  configuration
54       file, as described in pcp.conf(5).
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SEE ALSO

57       PCPIntro(1) and pmcd(1).
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61Performance Co-Pilot                  PCP                         PMDAZSWAP(1)
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