Solaris Process Managment Post: 302533654

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Operating Systems Solaris Solaris Process Managment Post 302533654 by DGPickett on Friday 24th of June 2011 10:25:12 AM

06-24-2011

Registered User

Well, leaks mean that programs use an increasing amount of swap, show a larger vm size on ps and may eventually bomb. Every malloc()/calloc()/realloc()/new must be to a pointer not overwritten or out of scope before a corresponding free()/delete, except if you exit(). If a subroutine returns a new object or dynamically allocated space, the caller may inherit the obligation to delete or free() when out of use, if not exit(). You may be calling other people's libraries that put this obligation on you.

Declaring excess or VM intensive choices is a more subtle, architectural problem.

The mmap()/mmap64() facilities are unique, allowing you to map files (or swap or copy to swap on write) creating memory spaces you can just reference for accessing values or to write (persistent) variable values, no read or write, just =, memcpy() and such. If you write a file and mmap() the file, not malloc and fill an array, you are still using as much RAM, and address space, but no swap space to provide rollout space for the array (sometimes, swap allocation is delayed until first rollout). If you run out of address space, you can munmap() some old space and mmap() a new chunk, so you have infinite VM (and potential RAM use) in just a 32 bit app. You can even do huge sparse arrays with seek, write -- ufs will not allocate blocks for null spaces never written, and mmap64() the whole sparse array. I wrote a fgrep that used open(), mmap(), string search, munmap(), close(). When testing, I did a search of every file, and rolled every app on the system out as I paged in files totaling more than the system RAM size, temporarily freezing every other application and user. Even after you close and munmap(), the file is available in RAM for the next mmap(), until it ages out. This is great for /lib/libc.so or moving your windows into files around, but not so great for private files in huge numbers.

What, exactly, is your concern?

Last edited by DGPickett; 06-24-2011 at 11:32 AM..

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install-solaris

install-solaris(1M)													       install-solaris(1M)

NAME

       install-solaris - install the Solaris operating system

SYNOPSIS

       install-solaris

       install-solaris	invokes  the  Solaris  Install	program. Depending on graphical capability and available memory at the time of invocation,
       install-solaris invokes either a text-based installer or a graphical installer.

       The following minimum requirements for physical memory dictate which features are available during installation:

       For SPARC machines:

       128 MB

	   Minimum physical memory for all installation types

       128 MB

	   Minimum physical memory required for windowing system

       384 MB

	   Minimum physical memory required for graphical-based installation

       For x86 machines:

       256 MB

	   Minimum physical memory for all installation types

       256 MB

	   Minimum physical memory required for windowing system

       512 MB

	   Minimum physical memory required for graphical-based installation

       In some cases, even if the minimum physical memory is present, available virtual memory after system startup can limit the number  of  fea-
       tures available.

       install-solaris	exists	only  on  the Solaris installation media (CD or DVD) and should be invoked only from there. Refer to the  for more
       details.

       install-solaris allows installation of the operating system onto any standalone system. install-solaris loads the software available on the
       installation media. Refer to the  for disk space requirements.

       Refer to the  for more information on the various menus and selections.

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWcdrom  (Solaris instal-  |
       |			     |lation media)		   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Evolving			   |
       +-----------------------------+-----------------------------+

       pkginfo(1), install(1M), pkgadd(1M), attributes(5)

       It is advisable to exit install-solaris by means of the exit options in the install-solaris menus.

								    23 Sep 2005 					       install-solaris(1M)