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Operating Systems Solaris Application running too slow on Sun SPARC T5440 but run normal on sun M3000 Post 302655327 by hergp on Wednesday 13th of June 2012 04:48:46 AM
Old 06-13-2012
Niagara CPUs are best suited for massive parallel loads, like webservers. Your machine can run 256 threads in parallel, giving each thread 1/256th of the overall computing power. But the single thread power is quite low, especially on early Niagara type CPUs, like the T1 and T2.

It seems, your application is composed of a few single threaded programs where each programm runs on a single virtual CPU, leaving most of the computing power unused. Such applications are not very well suited for a Niagara CPU server.

Your application runs well on the M3000, because the SPARC64 CPUs are designed for only few threads with a lot of computing power per thread.

Sun's Rock CPU was supposed to close the gap between those two architectures, but was never brought to market. The new T4 CPU seems to come close to this goal.
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CHCPU(8)							   User Manuals 							  CHCPU(8)

NAME
chcpu - configure CPUs SYNOPSIS
chcpu [-e] [-d] [-c] [-g] cpu-list chcpu [-p] mode chcpu -r chcpu [-h] [-V] DESCRIPTION
chcpu can modify the state of CPUs. It can enable or disable CPUs, scan for new CPUs, change the CPU dispatching mode of the underlying hypervisor, and request CPUs from the hypervisor (configure) or return CPUs to the hypervisor (deconfigure). Some options have a cpu-list argument. Use this argument to specify a comma-separated list of CPUs. The list can contain individual CPU addresses or ranges of addresses. For example, 0,5,7,9-11 makes the command applicable to the CPUs with the addresses 0, 5, 7, 9, 10, and 11. OPTIONS
-r, --rescan Trigger a rescan of CPUs. Use this option on systems that do not automatically detect newly attached CPUs. The Linux kernel then recognizes the new CPUs. -c, --configure cpu-list Configure all specified CPUs. Configuring a CPU means that the hypervisor takes a CPU from the CPU pool and assigns it to the vir- tual hardware on which your kernel runs. -e, --enable cpu-list Enable all specified CPUs. Enabling a CPU means that the kernel sets it online. A CPU must be configured, see -c, before it can be enabled. -p, --dispatch mode Set the CPU dispatching mode (polarization). This option has an effect only if your hardware architecture and hypervisor support CPU polarization. Available modes are: horizontal The workload is spread across all available CPUs. vertical The workload is concentrated on few CPUs. -d, --disable cpu-list Disable all specified CPUs. Disabling a CPU means that the kernel sets it offline. -g, --deconfigure cpu-list Deconfigure all specified CPUs. Deconfiguring a CPU means that the hypervisor removes the CPU from the virtual hardware on which the Linux instance runs and returns it to the CPU pool. A CPU must be offline, see -d, before it can be deconfigured. -h, --help Display help information and exit. -V, --version Display version information and exit. AUTHOR
Heiko Carstens <heiko.carstens@de.ibm.com> COPYRIGHT
Copyright IBM Corp. 2011 SEE ALSO
lscpu(1) AVAILABILITY
The chcpu command is part of the util-linux package and is available from Linux Kernel Archive <ftp://ftp.kernel.org/pub/linux/utils/util- linux/>. Linux June 2012 CHCPU(8)
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