Difference: ReleaseNotes1841 (12 vs. 13)

Revision 132008-08-28 - SalvatoreMonforte

Line: 1 to 1
 
META TOPICPARENT name="WebHome"

Release notes for Patch #1841

Line: 15 to 15
 
  • Modified design to allow DNS load balancing
Changed:
<
<
  • LDAP queries to fetch information in the Information Supermarket from the BDII can now be pre-filtered. This can be very helpful whenever a WMS instance is dedicated to only one VO. Typically, using a production BDII, the ISM reaches a size of 6-7000 entries, with the consequence that the match-making for a job can take a time of the order of ten seconds. Using the filter on the VO name, as for the aforementioned use-case, significantly reduces the MM time. The filtering expression has to be set using an environment variable, as shown in the following example:
>
>
  • LDAP queries to fetch information in the Information Supermarket from the BDII can now be pre-filtered. This can be very helpful whenever a WMS instance is dedicated to only one VO. Typically, using a production BDII, the ISM reaches a size of 6-7000 entries, with the consequence that the match-making for a job can take a time of the order of ten seconds. Using the filter on the VO name, as for the aforementioned use-case, significantly reduces the MM time. The filtering expression has to be set by assigning the relevant parameter within the WorkloadManager section of the configuration file, as shown in the following example:
    • IsmIiLDAPCEFilterExt="(|(GlueCEAccessControlBaseRule=VO:cms)(GlueCEAccessControlBaseRule=VOMS:/cms/*))"
 
  • Purchasing from CEMon has been temporarily disabled
Line: 32 to 32
 This problem can be avoided using run-time redirection to whatever lock-free, optimized alternative allocator, to avoid excessive swap activity. It is highly suggested doing so wherever RAM is less than or equal to 4Gb. Here is our recipe which makes use of the TCmalloc, such an alternate allocator distributed by Google under BSD license: * install the two rpms, google-perftools-devel-???.rpm and google-perftools-???.rpm (just pick up the latest version, older versions should work anyway, just in case),
Changed:
<
<
* enable redirection to tcmalloc with: export LD_PRELOAD="/usr/lib/libtcmalloc.so" in the glite-wms-wm script. Even if not specifically recommended (actually it may not work with everything) run-time malloc redirection has proven to get along well with the glite workload manager.
>
>
* enable the performance tools by editing the glite-wms-wm script. It is just a matter of removing the comment in the following line:
#use_google_perf_tools=1
.
 

-- AlessioGianelle - 27 May 2008 \ No newline at end of file

 
This site is powered by the TWiki collaboration platformCopyright © 2008-2021 by the contributing authors. All material on this collaboration platform is the property of the contributing authors.
Ideas, requests, problems regarding TWiki? Send feedback