search for: outperform

Dear all, I ran a small program to test the popen() function call performance on both a VM and a physical machine. The program just does a loop of popen() for 20 times and records the total execution time. The host of the VM has the same hardware configurations as the physical machine. The VM and the physical machine both have 2.6.11 kernel. The 20 popen() loops run for 0.453s on VM 0.690s on

...ovide reference implementations of these facilities. That said, the PyPy group has llvmgcroot support on a branch; you could ask Armin Rigo <arigo at tunes dot org> for details about accessing it. On his benchmarks, Armin saw an 8% speedup vs. a shadow stack. Their gcc backend still outperforms the LLVM backend, though—and llvm-gcc outperforms that further still. So perhaps those llvm-gcc GC extensions could be put to good use after all! :) — Gordon

ACE issued following PR: http://www.ace.nl/news/aces-cosy-compiler-framework-outperforms-llvm-arm9-processor Weird that they don't give any number and use ARM 9, do they mean cortex-a9 ?

...anted to gauge which would be preferred: > > >> 1. Use xxhash instead. > I'd lean towards this option as we already have a copy of xxHash in lib/Support (llvm/Support/xxhash.h). We use it for computing the --build-id in lld as fast/non-crytographic hash variant and has proven to outperform other candidates (e.g. CityHash). Vedant, what do you mean with unsupported? -- Davide "There are no solved problems; there are only problems that are more or less solved" -- Henri Poincare

...there, We're currently attempting to explain a slowdown of an LVQ-type parallel analysis we're working on. We are benchmarking our analysis running over openMosix against the same running via SNOW for R. Both perform similarly on small datasets, but on large datasets SNOW drastically outperforms openMosix. However, these results are achieve running SNOW on the default RedHat kernel (Enterprise Edition, RHEL-3) and mosix on the same kernel patched with the rpm for RedHat 9 from sourceforge. Even though the rpm seems to be compatible and everything runs fine, when the same SNOW analys...

Hi, all: I want to check small files' property(such as date, path, and so on) frequently. The files are stored in netwrok driver and their sizes vary from 2KB to 5KB. I found that Windows 2K outperform Linux/Samba very much after I campared the bench results. I am very confused about it and who can explain it? The computers' configurations are as follows: 1. PC Client It runs the follow VB program to compute the time when check files' property Operation System: Windows 2000 prof...

...of these facilities. > > That said, the PyPy group has llvmgcroot support on a branch; you > could ask Armin Rigo <arigo at tunes dot org> for details about > accessing it. > > On his benchmarks, Armin saw an 8% speedup vs. a shadow stack. Their > gcc backend still outperforms the LLVM backend, though—and llvm-gcc > outperforms that further still. The second part of this is not correct. I don't think we ever even tried llvm-gcc on the output of our C backend. What we see on x86 machines is that LLVM's own code generators produce slower code than using LL...

Hi all, This patch adds two new apodization functions that I developed. From my own test results (on quite a diverse dataset) they outperform the current best apodizations by 0.05% - 0.1% (depending on the specifics) on compression. Here's a selection of the test results *Apodization functions* ,Compres, Speed partial_tukey(2) tukey(0.5) , 56.50 , 37.2x partial_tukey(3) , 56.51 , 37.0x tukey(0.75)...

I listened to the Oracle webcast about their new upcoming development tools. They mentioned that their C/C++ compiler "far outperforms all open source alternatives". I asked the question if they have any benchmark URL supporting this statement. They actually answered. They said that they stopped publishing benchmark results. But they said that on Intel platform their compiler outperforms gcc by 43% for integers and 3X f...

...ibrary for curve25519/ed25519 and I have placed it in the public domain. It support DH key exchange as well as ed25519 keygen, sign and verify. The implementation is constant-time, supports blinding, bulk-verify and more. The library is available as portable-C as well as ASM for Intel-x64 CPUs. It outperforms curve25519-donna by a factor of 3.6 to 11 depending on the target. You may have a look at the source code hosted at: https://github.com/msotoodeh/curve25519. I was wondering if OpenSSH is a suitable home for this library? Thanks, Mehdi.

...paper describes how, by designing the context switch as a compiler intrinsic instead of a runtime library function, many existing compiler optimizations can be automatically applied to user-space context switches. The paper shows the results of many benchmarks, all of which show this model heavily outperforming existing models of context switching, in both speed and memory usage. For example, it mentions that the POSIX functions makecontext() and swapcontext() save a structure that’s 936 bytes in size (768 on my machine), but their model generates context switches that save only 8-80 bytes of CPU state...

I am planning to build a server based on the SuperMicro X7DBE+-O motherboard. This server will have two dual-core Xeon processors and a 3ware 9550SX raid card. Has anyone built a server based on this motherboard? Are there any issues with the smp/dual-core support in CentOS4 that might cause problems? I appreciate any input. I'm just looking to find out about any possible problems before

...l sites. One of the main arguments against OpenVZ is unpredictable and variable performance because VPS-hosts tend to overbook their host capacitiy. This is not an issue for us since we host our own VPSs on our own hardware so we are in complete control. So: Is there any reason Xen may be able to outperform OpenVZ for the webserver-setup I have described, or should I just continue to use OpenVZ? Cheers, Einar Sources: [1] http://www.ilsistemista.net/index.php/virtualization/1-virtual-machines-performance-comparison.html?start=13 [2] http://2bits.com/articles/hosting-virtualization-openvz-vs-xen-whic...

...compression setting match very closely, so the accuracy is probably pretty high. I did this comparison on Kubuntu 12.10 64-bit. http://www.icer.nl/misc_stuff/All tracks.pdf http://www.icer.nl/misc_stuff/Coldplay - Parachutes.pdf I was surprised to see that the Windows compile on wine actually outperformed the native Linux one. Probably GCC 4.6 optimized a little better or something very weird is going on in wine, I don't know. The assembly optimizations work very well on encoding, but actually slow things down when decoding. The difference is not very large however. Anyway, I think I'm...

Vanhorn, Mike wrote: > On 5/17/17, 12:03 PM, "CentOS on behalf of ken" <centos-bounces at centos.org > on behalf of gebser at mousecar.com> wrote: > >>An entire filesystem (~180g) needs to be copied from one local linux >>machine to another. Since both systems are on the same local subnet, >>there's no need for encryption. >> >>I've

...Mono was up to 12x slower than LLVM before and is now only 2.2x slower on average. Interestingly, the JVM scores slightly higher than LLVM on this benchmark on average and beats LLVM on two of the five individual tests. The individual scores are particularly enlightening. Specifically: . LLVM outperforms all other VMs by a significant margin on FFT, Monte Carlo and sparse matrix multiply. . LLVM is beaten by the JVM on successive over-relaxation (SOR) and LU decomposition. In the context of the SOR test, I suspect the JVM is using alias information to perform optimizations that LLVM and llvm-...

...f using some PERL module (like DBD::Oracle) to do the extraction, as opposed to using RODBC (assuming RODBC can be implemented in batch mode)? I'm currently using Apache on Windows XP if relevant, but LINUX may be the final host (we'll compare, but those more Web-wise than I expect LINUX to outperform Windows for our purposes). > Mark Fowler > Marine Fish Division > Bedford Inst of Oceanography > Dept Fisheries & Oceans > Dartmouth NS Canada > fowlerm at mar.dfo-mpo.gc.ca > >

On Jul 27, 2012, at 9:36 AM, Sebastien DELDON-GNB wrote: > ACE issued following PR: > http://www.ace.nl/news/aces-cosy-compiler-framework-outperforms-llvm-arm9-processor > Weird that they don't give any number and use ARM 9, do they mean cortex-a9 ? It's impossible to say. This sort of marketing statement is impossible to refute, because there are no details. Who knows whether they compared against LLVM fairly with it tuning for t...

Hi: In my opinion, we should axe all pure asm implementations in src/libFLAC/ia32 and the relevant configure options. Reasons are simple: - modern compilers plus the use of intrisincs make the code as faster as possible, if you need maximum speed I suggest you to build with profiling enabled. ;) - there is no support for x86_64 (that is.. all modern PC ;-) ) or for arm (most modern

...w it. Sunday morning after a really good night's sleep seems like a good time for that :-). I've currently got this patch in an un-published branch. > This patch adds two new apodization functions that I developed. > From my own test results (on quite a diverse dataset) they > outperform the current best apodizations by 0.05% - 0.1% > (depending on the specifics) on compression. > > Here's a selection of the test results > > *Apodization functions* ,Compres, Speed > partial_tukey(2) tukey(0.5) , 56.50 , 37.2x > partial_tukey(3)...