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...usec on standard Linux but only 41 usecs on XenLinux. An stat64 call runs 75 usecs on standard Linux but only 19 usecs on XenLinux. The Xen VM runs on the same physical machine as the standard Linux. It uses loopback files in dom0 as the backends of VBDs. Any insight is highly appreciated. Thanks. Xuehai XenLinux: # strace -c /bin/sh -c /bin/echo foo % time seconds usecs/call calls errors syscall ------ ----------- ----------- --------- --------- ---------------- 39.05 0.001972 1972 1 write 19.35 0.000977 977 1 execve 7.7...

On Fri, Apr 4, 2008 at 2:38 AM, Bill Wendling <isanbard at gmail.com> wrote: > On Apr 2, 2008, at 10:11 PM, Xuehai Qian wrote: > > Hi LLVMers, > > I am a PHD student in CS dept in UIUC, I am doing a project for > > Vikram's course, it is about PRE. I would like to know why you didn't > > choose SSAPRE in LLVM, since it seems to be more suitable for LLVM (it > > can...

...n UIUC, I am doing a project for Vikram's course, it is about PRE. I would like to know why you didn't choose SSAPRE in LLVM, since it seems to be more suitable for LLVM (it can operate directly on SSA form and avoid the conversion between SSA and bit-vector). Can anyone tell me the reason? Xuehai

On Apr 4, 2008, at 4:51 PM, Daniel Berlin wrote: > On Fri, Apr 4, 2008 at 2:38 AM, Bill Wendling <isanbard at gmail.com> > wrote: >> On Apr 2, 2008, at 10:11 PM, Xuehai Qian wrote: >>> Hi LLVMers, >>> I am a PHD student in CS dept in UIUC, I am doing a project for >>> Vikram's course, it is about PRE. I would like to know why you >>> didn't >>> choose SSAPRE in LLVM, since it seems to be more suitable for LL...

On Apr 2, 2008, at 10:11 PM, Xuehai Qian wrote: > Hi LLVMers, > I am a PHD student in CS dept in UIUC, I am doing a project for > Vikram's course, it is about PRE. I would like to know why you didn't > choose SSAPRE in LLVM, since it seems to be more suitable for LLVM (it > can operate directly on SSA form a...

.... Instrumenting the application code shows the application spends more time on popen() calls on domU than on the physical machine. I wonder if xenlinux does some special modification of the popen code to improve its performance than the original Linux popen code? Thanks in advance for your help. Xuehai _______________________________________________ Xen-devel mailing list Xen-devel@lists.xensource.com http://lists.xensource.com/xen-devel

...x). Also, I checked the "DMA" config information from the output of dmesg. I tried to run "hdparm -i" and "hdparm -I" but they didn''t work. Seems they didn''t work with SCSI disks. The following are the results. Thanks in advance for your help. Best, Xuehai 1. cctest1 (dumU) ************************************************************************************************** cctest1$ df -lh Filesystem Size Used Avail Use% Mounted on /dev/sda1 1.5G 1.1G 306M 78% / tmpfs 62M 4.0K 62M 1% /dev/shm /dev/sda6...

...ler than 2 * X from my experimental results. Why the time of transferring the file to 2N nodes is shorter than twice of the time of transferring the same file to N nodes? Does it make sense to you? What could be the reason if it makes sense in some way? Thank you so much for your help in advance! Xuehai P.S. the script to do the parallel rsync #!/bin/sh LIST="ccn2" if [ "$#" -gt "0" ] ; then if [ "$1" -eq "2" ] ; then LIST="ccn2" fi if [ "$1" -eq "4" ] ; then LIST="ccn2 ccn3 ccn4"...

On Fri, Apr 4, 2008 at 5:58 PM, Vikram S. Adve <vadve at cs.uiuc.edu> wrote: > On Apr 4, 2008, at 4:51 PM, Daniel Berlin wrote: > > > On Fri, Apr 4, 2008 at 2:38 AM, Bill Wendling <isanbard at gmail.com> > > wrote: > >> On Apr 2, 2008, at 10:11 PM, Xuehai Qian wrote: > >>> Hi LLVMers, > >>> I am a PHD student in CS dept in UIUC, I am doing a project for > >>> Vikram's course, it is about PRE. I would like to know why you > >>> didn't > >>> choose SSAPRE in LLVM, since it seem...

...the network card of the domain. I found the configuration always goes to the first NIC, eth0. If I want to config the 2nd NIC for the domain, is there anywhere I can do similar configuration as what for eth0 in the config file or I have to edit /etc/network/interfaces inside of the domain? Thanks. Xuehai ------------------------------------------------------- SF email is sponsored by - The IT Product Guide Read honest & candid reviews on hundreds of IT Products from real users. Discover which products truly live up to the hype. Start reading now. http://ads.osdn.com/?ad_id=6595&alloc_id=1...

...me 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 the physical machine. I will appreciate if you give me some insight of what cause the disparity. Thanks in advance for your help. Best, Xuehai _______________________________________________ Xen-devel mailing list Xen-devel@lists.xensource.com http://lists.xensource.com/xen-devel

...t;IP-Config: Unable to set interface netmask (-22)" problem when using option (b). For (a), I don''t have such problem. The boot information for both (a) and (b) is same. Could you please let me know what I am missing for (b) or is it a bug? BTW, my Xen version is 2.0-testing. Thanks Xuehai (a) $ cat vwconfig kernel = "/boot/vmlinuz-2.6.11-xenU" memory = 256 name = "ucvosg" disk = [ "file:/tmp/vosg/vosg-gk-rootfs.img,sda1,w" , "file:/tmp/vosg/swap1.img,sda2,w" ] nics=2 hostname="alex.cs.uchicago.edu" ip="128.135.164.83" net...

...x). Also, I checked the "DMA" config information from the output of dmesg. I tried to run "hdparm -i" and "hdparm -I" but they didn''t work. Seems they didn''t work with SCSI disks. The following are the results. Thanks in advance for your help. Best, Xuehai 1. cctest1 (dumU) ************************************************************************************************** cctest1$ df -lh Filesystem Size Used Avail Use% Mounted on /dev/sda1 1.5G 1.1G 306M 78% / tmpfs 62M 4.0K 62M 1% /dev/shm /dev/sda6...

I am seeing a problem with Dom0 crashing on x86_64 whenever I create a DomU. I''ve done some more testing, and it appears that this problem is somehow related to networking. Dom0 crashes as soon as the networking services are started when DomU is coming up. As an experiment, I brought up DomU without networking, and it stayed up. As soon as I started DomU with networking enabled, however,