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Search: Posts Made By: Ethan Hansen
Forum: Information & Answers 2018-06-21, 17:22
Replies: 16
Views: 4,659
Posted By Ethan Hansen
Workaround for older Centos versions

I updated mprime to v29.4.7 and the bundled libgmp.so did not work. The system I am running on is Centos 6 based. At best, I got a segmentation fault. Simply running mprime produced the familiar...
Forum: Software 2014-02-23, 05:42
Replies: 68
Views: 7,882
Posted By Ethan Hansen
I'm finding the same problem with both Centos and...

I'm finding the same problem with both Centos and RHEL systems. Running on older Centos/RHEL distros gives more errors still. For example on Centos 5.10, I see:
$ ./mprime -v
./mprime:...
Forum: Software 2010-10-19, 16:33
Replies: 76
Views: 11,398
Posted By Ethan Hansen
I've searched this forum and pored over the...

I've searched this forum and pored over the readme.txt and undoc.txt files to no avail. I'm assuming the Affinity=100 line in local.txt turns on Smart Affinity. How does one (a) disable Smart...
Forum: Software 2010-10-18, 17:23
Replies: 76
Views: 11,398
Posted By Ethan Hansen
Processor affinity in Linux x64 version

As far as I can ascertain, there appears to be no method to force CPU affinity for each thread on mprime x64, at least for dual-processor, hyperthreaded systems. This behavior predates V26.3, but it...
Forum: Software 2008-11-25, 01:56
Replies: 15
Views: 1,919
Posted By Ethan Hansen
For those stuck without the latest libcurl,...

For those stuck without the latest libcurl, compiling it from source is not difficult. A quick walkthrough:



Download the Curl source (http://curl.haxx.se/download.html) to a new directory.
...
Forum: PrimeNet 2007-10-25, 19:24
Replies: 17
Views: 1,203
Posted By Ethan Hansen
George, Your rant brings back unpleasant...

George,

Your rant brings back unpleasant memories. I'll add my voice to the chorus above: dump SQL Server 2000 if at all possible. SP4 fixed most of the memory leaks noted above, but the locking...
Forum: Hardware 2007-10-04, 19:00
Replies: 11
Views: 3,000
Posted By Ethan Hansen
Gotcha - My mistake.

Gotcha - My mistake.
Forum: Hardware 2007-10-03, 16:54
Replies: 11
Views: 3,000
Posted By Ethan Hansen
-> A 4GHz, 4-core, 4-issue processor will do...

-> A 4GHz, 4-core, 4-issue processor will do 4x4x4 = 64 GFLOPS theoretical peak. PERIOD!

You are assuming a processor is capable of only one floating point operation per clock cycle. This hasn't...
Forum: Hardware 2007-08-07, 22:29
Replies: 15
Views: 1,096
Posted By Ethan Hansen
I am partial to the Lenovo T-Series laptops, at...

I am partial to the Lenovo T-Series laptops, at least in their previous IBM incarnation. They are actually designed for mobile use. The keyboard covers the maximum amount of real estate, rather than...
Forum: Software 2007-04-12, 19:32
Replies: 2
Views: 851
Posted By Ethan Hansen
Set the affinity to one virtual processor. It...

Set the affinity to one virtual processor. It does not matter which one. This eliminates a small amount of swapping that would otherwise occur.

A pertinent question is whether you plan on running...
Forum: Hardware 2007-03-27, 22:40
Replies: 6
Views: 2,349
Posted By Ethan Hansen
Get the "+" version of memtest86...

Get the "+" version of memtest86 (http://www.memtest.org/). It supports most modern processors. If your system survives several passes through the extended test, all should be fine from a memory...
Forum: PrimeNet 2007-03-08, 06:57
Replies: 8
Views: 1,041
Posted By Ethan Hansen
Free command line tool:...

Free command line tool: http://www.bzip.org/downloads.html (no cygwin required)

GUI version: http://cgpgroup.com/index.asp?PgToLd=WBZIP2
Forum: Software 2007-03-08, 06:50
Replies: 4
Views: 529
Posted By Ethan Hansen
The latest update is that the resurgence of HT is...

The latest update is that the resurgence of HT is pushed out indefinitely, or at least past 2008, whichever comes first. Nothing like updated power numbers to make a bad idea look even worse...
Forum: Software 2007-03-08, 06:47
Replies: 41
Views: 2,441
Posted By Ethan Hansen
It turned out that the numbers I posted for the...

It turned out that the numbers I posted for the Xeon system were using 1 LL test but 2 threads for the 2M test. The timings were 0.066 s/iteration with 2 threads running, 0.071 s/iteration with only...
Forum: Software 2007-03-07, 23:07
Replies: 41
Views: 2,441
Posted By Ethan Hansen
George, Sorry, I'm not following you. The...

George,

Sorry, I'm not following you. The Test/Worker Threads dialog has an entry for Number of Worker Threads, but I do not see an option to set the number of threads per LL test. I'm running the...
Forum: Software 2007-03-07, 19:53
Replies: 41
Views: 2,441
Posted By Ethan Hansen
I tested 1M and 2M FFT sizes on two processors....

I tested 1M and 2M FFT sizes on two processors. Both CPUs are 3GHz, making the comparisons easier. The first system uses a desktop P4 processor with an 8K L1 cache and 512K L2. The second is a Xeon...
Forum: Software 2007-02-14, 01:28
Replies: 4
Views: 529
Posted By Ethan Hansen
Update for Hyperthreading/SMT code

George, et. al.:

As you are likely aware, the 45nm iteration of Intel's finest will reintroduce hyperthreading, albeit with the new name of SMT (super mondo-threading or the like). This may well...
Forum: Hardware 2007-02-12, 20:58
Replies: 5
Views: 816
Posted By Ethan Hansen
Add my voice to the ThinkPad chorus. If you are...

Add my voice to the ThinkPad chorus. If you are after a laptop actually designed for use on the road or in locations other than your desk, the IBM/Lenovo notebooks are hard to beat. They do not offer...
Forum: Miscellaneous Math 2006-11-21, 20:05
Replies: 10
Views: 1,734
Posted By Ethan Hansen
... have found no references to any theory...

... have found no references to any theory predicting gaps between primes.

A good reference is HG Diamond's Elementary methods in the study of the distribution of prime numbers, Bull. of American...
Forum: Hardware 2006-11-21, 15:03
Replies: 5
Views: 565
Posted By Ethan Hansen
Still sounds like a bad power supply...

Still sounds like a bad power supply...
Forum: Software 2006-11-20, 17:21
Replies: 18
Views: 1,401
Posted By Ethan Hansen
The sound I hear is the case fans SLOWING DOWN...

The sound I hear is the case fans SLOWING DOWN ever so slightly as soon as the task manager peaks out on CPU usage. This is not heat related... it is load related.

This, coupled with the voltage...
Forum: Hardware 2006-11-14, 21:42
Replies: 3
Views: 769
Posted By Ethan Hansen
Not a serious concern. This is a carryover bug...

Not a serious concern. This is a carryover bug from the Xeon 5100, first reported in June (http://download.intel.com/design/Xeon/specupdt/31335604.pdf) as #AG39. Hitting this requires a specific data...
Forum: Miscellaneous Math 2006-11-09, 17:36
Replies: 105
Views: 5,776
Posted By Ethan Hansen
It is irksome that troels munkner still seems to...

It is irksome that troels munkner still seems to be a celebrity after I have made two postings of trivial background on why and what the limits of his formula.

Allusions to wheel sieving aren't...
Forum: Hardware 2006-11-06, 21:19
Replies: 5
Views: 799
Posted By Ethan Hansen
I wouldn't advise running HT with p95, it slows...

I wouldn't advise running HT with p95, it slows down your normal applications even when running 1 client.

True enough. When you run a single process of your own that consumes the entire CPU, the...
Forum: Software 2006-10-26, 17:24
Replies: 19
Views: 1,542
Posted By Ethan Hansen
I see a very slight increase in iteration speed -...

I see a very slight increase in iteration speed - less than 2% - when one CPU runs Prime95 at priority 10. The overall throughput from both processors remained the same over the course of almost a...
Showing results 1 to 25 of 40

 
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