Optimizing the system reliability Post: 32976

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Special Forums Hardware Filesystems, Disks and Memory Optimizing the system reliability Post 32976 by Deepa on Wednesday 11th of December 2002 10:09:19 PM

12-11-2002

Registered User

Thanks Perderabo!

As you said, "Reliability will require duplicate servers, preferably in different cities", we do have a duplicate sun box geographically located in different cities, which has the same configuration and with the same number of processes running on it.

But the secondary machine is used only when the primary machine goes for a toss.

I am trying to find out the number of parallel instances of each process to be running in each machine, to attain a better reliability.

As u rightly said, we have to benchmark for gaining performance. I happened to hear about the genetic algorithm which can be applied for similar type of scenario. But still, we have to define the performance calculation of each process (considering the CPU load, memory usage, database accessing, IPC access etc) and provide it as one of the input to genetic algorithm.

I am not sure if any of our forum members are aware of this genetic algorithm(GA) concept. If anyone knows a good GA site/forum from where we can grab some information, pls let me know.

Thanks

Deepa

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jmap

jmap(1) 						      General Commands Manual							   jmap(1)

NAME

       jmap - memory map

SYNOPSIS

       jmap [ option ] pid
       jmap [ option ] executable core
       jmap [ option ] [ server-id@ ] remote-hostname-or-IP

DESCRIPTION

       jmap prints shared object memory maps or heap memory details of a given process or core file or remote debug server.

       NOTE  - This utility is unsupported and may or may not be available in future versions of the J2SE SDK.	jmap is not currently available on
       Windows platforms or on the Linux Itanium platform.

PARAMETERS

       option	      Options are mutually exclusive. Option, if used, shouldfollow immediately after the command name.

       pid	      process id for which the memory map is to be printed.  The process must be a Java process. To get a list of  Java  processes
		      running on a machine, jps may be used.

       executable     Java executable from which the core dump was produced.

       core	      core file for which the memory map is to be printed.

       remote-hostname-or-IP
		      remote debug server's (see jsadebugd) hostname or IP address.

       server-id      optional unique id, if multiple debug servers are running on the same remote host.

OPTIONS

	<no option>   When  no	option	is used jmap prints shared object mappings. For each shared object loaded in the target VM, start address,
		      the size of the mapping, and the full path of the shared object file are printed. This is similar to the Solaris pmap  util-
		      ity.

       -heap	      Prints a heap summary. GC algorithm used, heap configuration and generation wise heap usage are printed.

       -histo	      Prints  a  histogram  of	the  heap. For each Java class, number of objects, memory size in bytes, and fully qualified class
		      names are printed. VM internal class names are printed with '*' prefix.

       -permstat      Prints class loader wise statistics of permanent generation of Java  heap.  For  each  class  loader,  its  name,  liveness,
		      address, parent class loader, and the number and size of classes it has loaded are printed.

       -h	      Prints a help message.

       -help	      Prints a help message.

SEE ALSO

       pmap(1) jps(1) jsadebugd(1)

								   13 June 2004 							   jmap(1)