09-10-2012
Again, thank you for your responses.
So please let me clarify a few points to be sure.
1. 'hergp' is saying that if the issue is that they are using a T1 T2 type multi core SPARC than the issue is not so much the 32 vs 64 bit compile as it is the single threaded vs multi-threaded processing. Correct?
On Windows x86 vs X64 we found that the increase in compiling to X64 is just under 20% (comparing the running of one process on the same input data). Would you expect something similar on SPARC?
2. 'jlliagreis' saying that if it is possible to design our program to be multi-threaded (which I don't think we can) or if we run the program in parallel processes on different sets of data instead of in sequence, then we should be able to see some improvement. However, the amount will depend on the type of bottle neck we are experiencing (which we do not know yet). So for example, if it is straight CPU bound then we should see the best improvement, whereas if it is I/O bound then they may be less improvement, etc.
3. How do I know if we are running T1 or T2 with regard to floating point? I noticed that you said it is niagara based on the sun4v. How do I tell what T level they have?
4. What Solaris SPARC hardware would be better for doing this type of processing? I am not sure we have a choice but I am certainly curious.
---------- Post updated at 04:40 PM ---------- Previous update was at 09:38 AM ----------
One other things. They have two servers. One is a T2 and the other a T3 and specifically they are:SunOS 5.10 Generic_147440-09 sun4u sparc SUNW,Sun-Fire-V245 (T2)
SunOS 5.10 Generic_147440-01 sun4v sparc sun4v (T3)
What does this tell us about single thread / multi-thread or floating point etc?
How does sun4v differ from sun4u? How does T2 differ from T3?
Thank you.
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LEARN ABOUT OPENSOLARIS
device_remap
device_remap(1M) System Administration Commands device_remap(1M)
NAME
device_remap - administer the Solaris I/O remapping feature
SYNOPSIS
/usr/platform/sun4v/sbin/device_remap [-v | -R dir]
DESCRIPTION
Certain multi-node sun4v platforms, such as T5440 and T5240 servers, have an integrated PCI topology that cause the I/O device paths to
change in a CPU node failover condition. The device remapping script, device_remap, remaps the device paths in /etc/path_to_inst file and
the symlinks under /dev to match the hardware.
OPTIONS
The following options are supported:
-v
Displays the /etc/path_to_inst and /dev symlink changes.
-R dir
Perform remapping on the /etc/path_to_inst and /etc/path_to_inst files in the root image at dir.
USAGE
The primary function of device_remap is to remap the device paths in the /etc/path_to_inst file and the symlinks under /dev in a CPU node
failover condition to match the hardware.
After adding CPU node(s) or removing CPU node(s), boot the system to the OBP prompt and use the following procedure:
1. Boot either the failsafe miniroot using: boot -F failsafe , or an install miniroot using boot net -s or similar command.
2. Mount the root disk as /mnt.
3. Change directory to the mounted root disk:
# cd /mnt
4. Run device_remap script:
# /mnt/usr/platform/sun4v/sbin/device_remap
5. Boot the system from disk.
All the error messages are self-explanatory, except for the error message "missing ioaliases node" which means the firmware on the system
does not support device remapping.
EXAMPLES
Example 1 Displaying Changes Following Failover
The following command displays the path_to_inst and /dev changes following a CPU node failover.
# device_remap -v
Example 2 Changing Directory Prior to Any Changes
The following command changes the directory on which the boot image is mounted prior to making any changes.
# device_remap -R /newroot
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Availability |SUNWkvm.v |
+-----------------------------+-----------------------------+
|Interface Stability |Unstable |
+-----------------------------+-----------------------------+
SEE ALSO
boot(1M), attributes(5)
SunOS 5.11 24 Dec 2008 device_remap(1M)