Re: Windows performance issue
On Jul 21, 2014 4:03 AM, Omar Orzenini omar.orzen...@gmail.com wrote: Hello everyone, I apologize for my poor english but I'll try to explain. I have a strange performance problem only under Windows (via NFS on Linux everything works fine). Tested operating system (Windows Server 2008 R2 64, WIndows Server 2012 R2): Second step: share the webapps folder (eg. c:\webapps) and change in the server.xml AppBase from webapps to \\servername\webapps. And now you have a dns query to lookup that server name each time. Does fully qualified domain name of the server help improve performance? Leo
RE: Windows performance issue
-Original Message- From: Omar Orzenini [mailto:omar.orzen...@gmail.com] Sent: Monday, July 21, 2014 6:42 AM To: Tomcat Users List Subject: Re: Windows performance issue Thank you all for the answers. I performed these tests because we are showing serious performance problems on WIndows configurations for load balancing (a file server shares the webapps folder via SMB for two different application servers that map the webapps via UNC. Tried both mapping the folder via UNC and as logical drive but i did not get great results. With that stated use case, it would be far safer to rethink your deployment scenario. With multiple Tomcats sharing the webapps directory, you run the risk of problems occurring because each Tomcat will want to explode the war files into a sub-tree structure, potentially causing problems for a server that is already running. I am sure there are more knowledgeable folks here that can address that scenario. You could, of course, turn off the explode warfiles setting and that would reduce that issue, but running from warfiles has its own performance hit. Might I suggest pointing webapps to an empty directory and using the docbase parameter of the Context to point to the shared directory structure with pre-exploded war file sub-trees? Of course, if the problem is really with SMB bottlenecks, that probably won't be that much more helpful. Q: Why bother with the shared directory issue at all? How about just copying the war file to each server and let them run from their local copies? That would result in the best performance. (note: this is what I do for my customer base and don't find it all that burdensome to roll out an upgrade for 100+ customers.) Jeff
Re: Windows performance issue
On 7/21/2014 5:03 AM, Omar Orzenini wrote: Hello everyone, I apologize for my poor english but I'll try to explain. I have a strange performance problem only under Windows (via NFS on Linux everything works fine). Tested operating system (Windows Server 2008 R2 64, WIndows Server 2012 R2): First step: the webapps folder is in the standard path (eg c: \tomcat \webapps) everything works fine and with excellent performance. Second step: share the webapps folder (eg. c:\webapps) and change in the server.xml AppBase from webapps to \\servername\webapps. In this case, despite the Tomcat service and the shared folder are on the same server, the load performance of applications collapse. I've done tests also sharing folders to other servers but nothing changes. On Linux NFS works very smoothly and with excellent performance. Do you have any suggestions? The TCP/IP stack on windows has lousy performance reading from a local HD compared, to the local drive access. We used to map a drive letter to a local drive, but found that using the subst command gave MUCH better performance. That technique is not really applicable to your situation, but illustrates that the TCP stack is a big performance hit. Thanks for everything, Omar - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: Windows performance issue
On Mon, Jul 21, 2014 at 5:03 AM, Omar Orzenini omar.orzen...@gmail.com wrote: Hello everyone, I apologize for my poor english but I'll try to explain. I have a strange performance problem only under Windows (via NFS on Linux everything works fine). Tested operating system (Windows Server 2008 R2 64, WIndows Server 2012 R2): First step: the webapps folder is in the standard path (eg c: \tomcat \webapps) everything works fine and with excellent performance. Second step: share the webapps folder (eg. c:\webapps) and change in the server.xml AppBase from webapps to \\servername\webapps. Have you tried referencing it as c:\webapps? It's on the same machine right? So why use the unc style path? In this case, despite the Tomcat service and the shared folder are on the same server, the load performance of applications collapse. Maybe hook up a profiler and see what's happening? I've done tests also sharing folders to other servers but nothing changes. On Linux NFS works very smoothly and with excellent performance. Do you have any suggestions? What are you trying to accomplish by sharing this folder? Dan
Re: Windows performance issue
Thank you all for the answers. I performed these tests because we are showing serious performance problems on WIndows configurations for load balancing (a file server shares the webapps folder via SMB for two different application servers that map the webapps via UNC. Tried both mapping the folder via UNC and as logical drive but i did not get great results. 2014-07-21 13:33 GMT+02:00 Daniel Mikusa dmik...@gopivotal.com: On Mon, Jul 21, 2014 at 5:03 AM, Omar Orzenini omar.orzen...@gmail.com wrote: Hello everyone, I apologize for my poor english but I'll try to explain. I have a strange performance problem only under Windows (via NFS on Linux everything works fine). Tested operating system (Windows Server 2008 R2 64, WIndows Server 2012 R2): First step: the webapps folder is in the standard path (eg c: \tomcat \webapps) everything works fine and with excellent performance. Second step: share the webapps folder (eg. c:\webapps) and change in the server.xml AppBase from webapps to \\servername\webapps. Have you tried referencing it as c:\webapps? It's on the same machine right? So why use the unc style path? In this case, despite the Tomcat service and the shared folder are on the same server, the load performance of applications collapse. Maybe hook up a profiler and see what's happening? I've done tests also sharing folders to other servers but nothing changes. On Linux NFS works very smoothly and with excellent performance. Do you have any suggestions? What are you trying to accomplish by sharing this folder? Dan
Re: Windows performance issue
On Mon, Jul 21, 2014 at 7:41 AM, Omar Orzenini omar.orzen...@gmail.com wrote: Thank you all for the answers. I performed these tests because we are showing serious performance problems on WIndows configurations for load balancing (a file server shares the webapps folder via SMB for two different application servers that map the webapps via UNC. Tried both mapping the folder via UNC and as logical drive but i did not get great results. I would suggest against sharing the webapps directory. I've seen this tried with NFS and it doesn't work great, I'd expect SMB to have similar results. If you want to store your WAR files on a shared file system, that's OK just copy them to the local disk first. Dan 2014-07-21 13:33 GMT+02:00 Daniel Mikusa dmik...@gopivotal.com: On Mon, Jul 21, 2014 at 5:03 AM, Omar Orzenini omar.orzen...@gmail.com wrote: Hello everyone, I apologize for my poor english but I'll try to explain. I have a strange performance problem only under Windows (via NFS on Linux everything works fine). Tested operating system (Windows Server 2008 R2 64, WIndows Server 2012 R2): First step: the webapps folder is in the standard path (eg c: \tomcat \webapps) everything works fine and with excellent performance. Second step: share the webapps folder (eg. c:\webapps) and change in the server.xml AppBase from webapps to \\servername\webapps. Have you tried referencing it as c:\webapps? It's on the same machine right? So why use the unc style path? In this case, despite the Tomcat service and the shared folder are on the same server, the load performance of applications collapse. Maybe hook up a profiler and see what's happening? I've done tests also sharing folders to other servers but nothing changes. On Linux NFS works very smoothly and with excellent performance. Do you have any suggestions? What are you trying to accomplish by sharing this folder? Dan
RE: Windows performance issue
Hi, -Original Message- From: David kerber [mailto:dcker...@verizon.net] Sent: Monday, July 21, 2014 1:31 PM To: Tomcat Users List Subject: Re: Windows performance issue On 7/21/2014 5:03 AM, Omar Orzenini wrote: Hello everyone, I apologize for my poor english but I'll try to explain. I have a strange performance problem only under Windows (via NFS on Linux everything works fine). Tested operating system (Windows Server 2008 R2 64, WIndows Server 2012 R2): First step: the webapps folder is in the standard path (eg c: \tomcat \webapps) everything works fine and with excellent performance. Second step: share the webapps folder (eg. c:\webapps) and change in the server.xml AppBase from webapps to \\servername\webapps. In this case, despite the Tomcat service and the shared folder are on the same server, the load performance of applications collapse. I've done tests also sharing folders to other servers but nothing changes. On Linux NFS works very smoothly and with excellent performance. Do you have any suggestions? The TCP/IP stack on windows has lousy performance reading from a local HD compared, to the local drive access. We used to map a drive letter to a local drive, but found that using the subst command gave MUCH better performance. That technique is not really applicable to your situation, but illustrates that the TCP stack is a big performance hit. Right; I when I try the same on a Windows Server 2012 R2 machine with a fresh Tomcat 8.0.9 (+ one additional webapp), then when using the local path for appBase, Tomcat starts in 2300 ms. When I share the webapps directory and use \\servername\webapps as appBase, startup time increases to 5600 ms. My guess on the performance drop would be that an open file operation takes additional time, and I can imagine Tomcat opens and closes a lot of different files during its startup (e.g. extracting an WAR archive). On the other side, Microsoft supports sharing a Hyper-V virtual hard disk driver over SMB which seems to perform reasonably well. However, in this case, only one file (the .VHDX file) is accesses from the remote machine (and is held open during a long time). I then created and mounted a VHDX file on a Windows Server 2012 R2 and formatted it with NTFS (it got the driver letter E:). Then, I dismounted it, and shared the folder (testfolder) which contains the VHDX file. I opened the path \\servername\testfolder in Explorer, right-clicked on the VHDX file and selected Mount to mount it over the UNC path. In Tomcat's configuration, I set the appBase to E:\webapps where I copied the webapps directory to. This time, when I then started Tomcat, it took only 2300 ms like when I used the local path for the appBase. So this might be an option if you want to store the webapps directory on some SMB file server. Note however, that after a restart you have to re-mount the VHDX file (e.g. using a diskpart script). Regards, Konstantin Preißer - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
