[rescue] Soliars, libc_psr.so.1, where does it come from?

[Jerry Kemp]

Gary,

thank you for the reply, but it is to the wrong person.

I answered Ethan O'Toole's question yesterday, who asked the original
question.

libc_psr.so.1 installs as part of the SUNWcar package.

Jerry


On 09/28/10 10:25, Gary Sloane wrote:
> Jerry -
> 
> The following should tell you all you need to know about libc_psr_hwcap1.so.1
> and libc_psr.so.1...
> 
> Gary
> 
> 
>> Recently i have installed a Sun OS 10 on ultra45, when check the file
>> system with command df -k appears this FS :
>>
>> */platform/sun4u-us3/lib/libc_psr/libc_psr_hwcap1.so.1
>>                     4033206  134824 3858050     4%
>> /platform/sun4u-us3/lib/libc_psr.so.1
>> /platform/sun4u-us3/lib/sparcv9/libc_psr/libc_psr_hwcap1.so.1
>>                     4033206  134824 3858050     4%
>> /platform/sun4u-us3/lib/sparcv9/libc_psr.so.1
>> *
>> Why..?
>>
>> I hope can you help me.
>>
>> Greetings.
>> Marcos
>>
> 
> hello Marcos,
> 
> take a look at this document it explains why and what these are:
> 
> Why do libc_psr_hwcap1.so.1 and libc_psr.so.1 show as mount points?
> 
> The purpose of this document is to help explain why the mount points
> detailed below are shown from df(1M) and mount(1M).
> 
> Under some circumstances, such as an operating system upgrade or patch
> installation, the following mount points may be shown from df(1M) and
> mount(1M):
> 
> /platform/sun4u-us3/lib/libc_psr/libc_psr_hwcap1.so.1
> mounted on
> /platform/sun4u-us3/lib/libc_psr.so.1
> ---
> /platform/sun4u-us3/lib/sparcv9/libc_psr/libc_psr_hwcap1.so.1
> mounted on
> /platform/sun4u-us3/lib/sparcv9/libc_psr.so.1
> --
> 
> An example of what could create these mounts is an OS upgrade to Solaris
> 10 (Update X) or the installation of patch 122750-XX.
> /
> Note: these are just examples - it may not be restricted to this /
> 
> These mounts will not show on all systems as the change is hardware
> specific, which the patch and OS are not.
> 
> ---
> 
> Why is this?
> 
> The mount points detailed have been created intentionally by
> engineering. In basic terms, they are a platform specific enhancement to
> ensure full application performance is achieved. This is done by
> changing the way the Operating System fully utilizes the  potential of
> the CPU for the platform.
> 
> The libc_psr libraries implement platform-specific, optimized versions
> of block copy and move routines from libc, such as memcpy(). On
> UltraSPARC machines, these routines are coded in assembler, and use
> block load and store ASI's, prefetch, and other tricks for better
> performance.
> 
> This is enabled using the HWCAP feature of the linker; see the linker
> guide for details (http://docs.sun.com/app/docs/doc/817-1984).
> <http://docs.sun.com/app/docs/doc/817-1984%29.>
> 
> The alternate routines live in the libc_psr_hwcap1.so.1 library.  At
> boot time, the libc_psr_hwcap1.so.1 library is loop-back mounted onto
> the libc_psr path using a combination of the moe(1) utility, and mount
> -F lofs, invoked from the start method of the
> svc:/system/filesystem/root service (/lib/svc/method/fs-root).  As this
> is a loopback mount, no disk space is waisted.
> This is the only way that this enhancement can be implemented, and at
> this time will not be changed. Disabling this functionality is not
> possible or supported.
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