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Top Forums UNIX for Advanced & Expert Users Solaris and Linux system information. Post 302156550 by drl on Tuesday 8th of January 2008 12:50:48 PM
Old 01-08-2008
Hi.

These kinds of comparisons can be difficult. I think both hardware and software need to be considered.
Quote:
the CPU on linux box is 2.80GHz and on solaris box is 900 MHz made the difference?
Not necessarily, let us look a bit more.

You are comparing a 64-bit native RISC system, the SPARCV9, to a most-likely-32-bit CISC system, the Intel Xeon. Typically, a RISC system does not need the high clock speed of CISC. Is the Xeon Linux 32-bit or 64-bit?

I have used boxes that have that Intel Xeon CPU (2.8 GHz), and the predecessor of the SPARCV9, an Ultra-2 (but with 200 MHz clock).

Did you do the preparation of the program? At one time (in the 1990s) when I was comparing machines, we would often get codes that ran on IBM 3090s, and they didn't run too quickly on a Cray-2. When we looked in detail at the code, there were lots of double precision declarations, the 3090 being 32-bit machines. The Crays were 64-bit. Once we had made the adjustment, the code almost always ran faster on the Cray.

The options chosen for compilation can make a lot of difference. Compilers that are proprietary might produce faster code than others. Are the supporting libraries the same or equivalent? Looking for the best algorithm is the best use of time when optimizing.

As porter mentioned, one aspect is IO. For IO-bound jobs, you need good disks, as well as good hardware to get the data to and from the disks. Do you have the same facilities on both boxes? The designers of the Xeon box I mentioned earlier incorporated a really fast FSB, which helps the balance of large-scale application programs -- they often do some computing, then a lot of IO, then compute, IO, etc., in cycles.

I think you are on the right track -- clock rates, all the specs, etc., are not the issue. It's how your program runs that will determine the best machine -- for this one application. However, I recommend that you spend some time making sure that the playing field is at least approximately level. If you are going to run other programs, then you will need a representative sample of those runs for a comparison. For example, the ETA-10 series were really good for vector-class problems, but not very good for scalar codes. Ask yourself: what is the mix that I will be using?

Best wishes, keep us posted ... cheers, drl
 

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Intel Xeon Phi (MIC) Specific Functions(3)		     Hardware Locality (hwloc)			Intel Xeon Phi (MIC) Specific Functions(3)

NAME
Intel Xeon Phi (MIC) Specific Functions - Functions static inline int hwloc_intel_mic_get_device_cpuset (hwloc_topology_t topology , int idx , hwloc_cpuset_t set) static inline hwloc_obj_t hwloc_intel_mic_get_device_osdev_by_index (hwloc_topology_t topology, unsigned idx) Detailed Description Function Documentation static inline int hwloc_intel_mic_get_device_cpuset (hwloc_topology_t topology, int idx, hwloc_cpuset_tset) [static] Get the CPU set of logical processors that are physically close to MIC device whose index is idx. Return the CPU set describing the locality of the MIC device whose index is idx. Topology topology and device index idx must match the local machine. I/O devices detection is not needed in the topology. The function only returns the locality of the device. If more information about the device is needed, OS objects should be used instead, see hwloc_intel_mic_get_device_osdev_by_index(). This function is currently only implemented in a meaningful way for Linux; other systems will simply get a full cpuset. static inline hwloc_obj_t hwloc_intel_mic_get_device_osdev_by_index (hwloc_topology_ttopology, unsignedidx) [static] Get the hwloc OS device object corresponding to the MIC device for the given index. Return the OS device object describing the MIC device whose index is idx. Return NULL if there is none. The topology topology does not necessarily have to match the current machine. For instance the topology may be an XML import of a remote host. I/O devices detection must be enabled in the topology. Note: The corresponding PCI device object can be obtained by looking at the OS device parent object. Author Generated automatically by Doxygen for Hardware Locality (hwloc) from the source code. Version 1.7 Sun Apr 7 2013 Intel Xeon Phi (MIC) Specific Functions(3)

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