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84397 discussions

Re: Speeding up wineserver syncronization objects with shared memory
by David Howells 07 Mar '01

07 Mar '01

Gavriel State <gav(a)transgaming.com> wrote: > As it stands, your approach won't be useful for general Wine usage until > you've got *everything* done. True. But I think there are valid reasons for doing it this way. One major problem is handles. Either the kernel must allocate all handles, or userspace must allocate all handles. Take something like the implementation of DuplicateHandle() - dead easy really in kernel space, including duplication to another process. If userspace tells the kernel to use handle X for a mutex, say, and handle Y for a semaphore, then userspace still has to go to atomic management code to (a) allocate a handle, and (b) access a handle. And to implement cross-process duplication, you either need some sort of interrupt & IPC mechanism, or an external process (the wineserver). This being the case, you lose any gains by putting the stuff in-kernel. Alternatively, if userspace is allowed to implement arbitrary handles that are allocated by the kernel, then the kernel waiting mechanism can get a little tricky. However, that said, for non-waitable objects, this might not be so bad. In fact, I'm planning on implementing the registry access handles this way and may well do some of the process and thread control this way too. Furthermore, the kernel would have to be given object handles not object pointers, otherwise you have a gaping security hole. And another major problem is context switches... they are horribly expensive really. They currently make Wine with at least 20 times the system call latency that the kernel method is capable of. > And then there will be boatloads of debugging to do. Perhaps not as much as you think... I'm doing as much debugging as I can as I go along, just making sure the kernel objects work as I'd expect (not necessarily the same thing, true, as having "compatible" behaviour). > If there's any way that you can implement your kernel module more within the > context of the existing server architecture - replacing objects on a piece > by piece fashion rather than all at once - that might make it easier to > adopt. See above for why the piece-by-piece method is difficult. One alternative would be to invent a new network protocol (say AF_WINE), but that again requires a complete implementation before it is really useful. > For example, you might try implementing the core object/handle management > and waiting code in the kernel module, and have the wine server rely on the > kernel module for that low-level functionality. By this, do you mean actually having the wineserver process talk to the kernel module on behalf of the Wine application? > Waiting for objects would be implemented on the client side through a call > to the kernel module. That's what I'm currently doing, though it's not fully implemented yet. > When something needs to be done with an object, we would call either the > wineserver or the kernel module, depending on how that object is > implemented. > For example, you could do mutexes entirely within the kernel module, but > leave file objects on the wine-server side initially. My main gripe is the slow speed of access to files... Every Read/WriteFile goes to the wineserver to convert the handle into a file descriptor and to check for locking. The FD is then passed back over a UNIX domain socket, used once and then closed. I suspect it can't really be done otherwise, particularly if ZwCloseObject (or whatever it is called) is implemented, since this allows handles in another process to be closed. Actually, I've done a fair amount of the file object stuff... Most of it involves mapping down to a "struct file *", which is how the kernel views files, and then invoking appropriate kernel method. > In my experience Alexandre far prefers incremental change to kind of > approach you're taking. Using that kind of approach will improve the > chances that your code will make it into Wine at some point. Hmmm... It's difficult to determine how to do it incrementally without making for even more work, but I think I know what you mean. > One thing I've been wondering that you might be able to answer is this: > exactly why is the current Wine Server architecture so slow? Is it just the > context switching? Context switching is the main element of it. Going to the wineserver and back again just for a ReadFile() call or a Wait*() function incurs a fairly serious penalty (particularly on an X86, I think). Plus there's no requirement for the kernel to pass the remains of your timeslice to the wineserver and back again. Also, you have to bundle lots of data through AF_UNIX network packets and/or copy lots of data into and out of _shared_ memory without killing other threads. One of the problems with the context switch is that you have to flush all the CPU caches, muck around with the MMU and execute scheduling algorithms. > Is it that the kernel isn't giving the wineserver a high enough priority > once the client blocks after having written to the socket? I don't think priority has anything much to do with it. A more convenient scheduling algorithm might help a little, though. > Is it other socket overhead (routing, perhaps)? Simply speeding up the > communications path between the clients and the server would remove the need > for most of the kernel level services. I don't think so... To communicate with the wineserver you have to use some sort of waitable UNIX object (ie: a socket, a pipe, or a SYSV semaphore or message), do busy waiting (& kill your CPU), or send signals (context switch _and_ signal overhead). To do it without a wineserver (ie: using shared memory) is also tricky... You have to be able to, for instance, recover from processes going away without releasing mutexes. > Also, just FYI, the PE image mapping work is nice, but isn't likely to affect > speed all that much, since Wine can just mmap in most PE images created with > recent compilers. WordPerfect, for example, launches in around 10-12 seconds > on my machine (down from 45-60 seconds before the mmaping). I can't imagine > that doing the fixups when paging instead would do too much better. Look at the VM size of something like MS Word, and think of not having to allocate buffers to store all those DLLs, thus eating a massive chunk out of your machines total VM. Plus, it should be even quicker launching because fixups don't have to be done unless they're necessary. You certainly don't have to go through an fixup a few tens of megs of DLL. Cheers, David

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Re: Wineserver semantics
by Alexandre Julliard 07 Mar '01

07 Mar '01

Ryan Cumming <bodnar42(a)bodnar42.dhs.org> writes: > What about having the file descriptor cache explictly invaildated? Like, > the server keeps track of which file descriptors the various wine > processes have cached, and if a process closes or performs some locking > operation on a file descriptor, all the other wine proceses that are using > that file descriptor are explictly notified. This way processes can assume > a file descriptor is valid unless told otherwise... would this be any > better performance-wise? Does it fit in to the wineserver architecture > nicely? ;) Not really; you'd either need to callback into the client, which creates a lot of synchronisation issues, or use a shared memory area which implies locking. Either way doesn't really fit in the current model. And as mentioned already we'll probably still need a server call on each file access to implement file locking. -- Alexandre Julliard julliard(a)winehq.com

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Re: Wineserver semantics
by Alexandre Julliard 06 Mar '01

06 Mar '01

Waldek Hebisch <hebisch(a)math.uni.wroc.pl> writes: > There is ongoing disscusion on how to seed up the wineserver. > So I have question concerning correctness of corrent implementation. > Namely, for reading or writing files I have not found any locking in > wineserver when issuing file descriptor to clients. On the other > hand the client closes file descriptor just after use, and also > disscusion in the group suggests that client is supposed to have > exclusive acces to file. So I would like to know what is the case: > 1) client is allowd to cache the descriptor > 2) current implementation depends on winning a race > 3) I missed locking in wineserver I'm not sure what you mean by 'exclusive access to the file'. If you mean file locking then this is not implemented, so there cannot be any race ;-) Currently the client is allowed to cache the descriptor, but before each read/write it checks with the server that the cache is still valid. There is a race that the handle can be modified between the check and the actual read, this will cause either a bad handle error or a read from the wrong file; but this is no different from what happens under Windows if the client is manipulating handles concurrently with a ReadFile. -- Alexandre Julliard julliard(a)winehq.com

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Re: winelauncher patch
by Jeremy White 06 Mar '01

06 Mar '01

Ove, I have in fact determined why I did not use which: On Suse (and Caldera, I believe), which /usr/bin/wine returns an error string, making the whole script go straight down the drain. What was wrong with the previous implemenation? Are you getting a $0 value that doesn't include the path? In all of the test cases I have, invoking wine seems to bring in a $0 that includes enough of the path for the find logic to work. Jer > Hunk 2: > real_name=`find $0` don't find anything if the user typed "wine" or > something, wine is in /usr/bin, which is in PATH, but the cwd is ~... > rather run it through `which $0` first. Also, the symlink it's reading > don't have to be absolute (my symlinks are relative), deal with that. > > -real_name=`find $0 -type l -printf "%l\n"` > +argv0_path=`which $0` > +if [ -z $argv0_path ] ; then > + argv0_path=$0 > +fi > + > +real_name=`find $argv0_path -type l -printf "%l\n"` > if [ ! $real_name ]; then > - real_name=$0; > + real_name=$argv0_path > +elif [ ! -x $real_name ]; then > + real_name=`find $argv0_path -printf "%h\n"`/$real_name > fi > + > argv0_dir=`find $real_name -printf "%h\n"` > > if [ -z $argv0_dir ] ; then > @@ -130,7 +138,7 @@ > WINESERVER=$WINEBIN/server/wineserver > fi

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Wineserver semantics
by Waldek Hebisch 06 Mar '01

06 Mar '01

There is ongoing disscusion on how to seed up the wineserver. So I have question concerning correctness of corrent implementation. Namely, for reading or writing files I have not found any locking in wineserver when issuing file descriptor to clients. On the other hand the client closes file descriptor just after use, and also disscusion in the group suggests that client is supposed to have exclusive acces to file. So I would like to know what is the case: 1) client is allowd to cache the descriptor 2) current implementation depends on winning a race 3) I missed locking in wineserver -- Waldek Hebisch hebisch(a)math.uni.wroc.pl or hebisch(a)hera.math.uni.wroc.pl

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WinCE/PocketWindows?
by Robert & Jennifer Hartley 06 Mar '01

06 Mar '01

Hi, (Please forgive me if this has already been examined, as this is my first post.) I am curious to know if a version of WINE has been considered that would be made to run WinCE (CE) and PocketWindows (PW) applications on Linux PDAs. I have been working with the Agenda VR3 PDA from www.agendacomputing that runs Linux very well on a MIPS processor. I also received a free set of Embedded Tools CDs from MicroSoft that have VC++ and VB on them for building CE and PW applications. The platforms it supports are X86, MIPS, ARM, and SH3, and I believe there are others. There is a compatability layer that runs on WinNT to test before deploying. If we had that emulated in Linux, then we would be most of the way towards being done. (Or so I would imagine.) Naturally, since I am a Linux/Unix guy, I was thinking that it would be neat to have these CE/PW apps running on my X86 Linux box, my NetWinder, my venerable old Indy, and finally, once debugged, on this Agenda Linux PDA. The WINE community has already done a huge amount of great work, so I thought that maybe a cut down version of WINE would work on the CE/PW subsets of Windows. Being an outsider, could someone let me know if I am totally out there in LaLa Land? Thanks, Rob (here around Ottawa, ON) -- =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= = Robert Hartley Mail: 201 Broadway = = Central Region Systems Engineer Cambridge, MA 02139 = = Integrated Computer Email: rhartley(a)ics.com = = Solutions, Inc. Web Site: www.ics.com = = Tech Support: support(a)ics.com Phone: 800-800-4271 = =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= Visit the MotifZone (www.motifzone.org) for info on Motif!

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Re: Perl/Wine extension for perusal
by Niki Spahiev 06 Mar '01

06 Mar '01

Hello, Two small suggestions: 1. python has very good WIN32 bindings and also generic DLL interface CALLDLL. 2. VNC has alpha of macro recorder which can be used for interactive tests. Regards, Niki Spahiev

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Re: RFC: client side implementation of async I/O
by Alexandre Julliard 06 Mar '01

06 Mar '01

Michael McCormack <mccormac(a)aals27.alcatel.com.au> writes: > This patch moves responsibility for asynchronous I/O to the client process. > i'm posting it to wine-devel because i want to know what other developers here > think about the technique i've used to make this work... Your approach is not going to work with the latest changes I made to the server. The good news is that the changes I'm making are in part to allow making server calls in signal handlers, so when this works you should be able to use SIGIO to do async IO. > i think this implementation is more efficient, as it makes fewer server calls > and duplicates fewer file descriptors, while maintaining correctness. It's not clear to me that it is more efficient; it seems it will do a lot more work on every single server call if an async IO is pending. Of course the only way to tell is to run benchmarks. -- Alexandre Julliard julliard(a)winehq.com

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TCP/IP networking and registry keys
by Alan Chandler 06 Mar '01

06 Mar '01

I spent most of the weekend trying to get Grand Prix Legends GPL to work. I achieved my first goal of getting it to run in server mode. One of the things I needed to get the game to do, was to recognise that there where some interfaces it could talk TCP/IP out of. It took me some time to realise that under windows it was doing this by looking for the key [System\\CurrentControlSet\\Services\\Class\\NetTrans] and was then enumerating the keys under it to establish an IP address ie the following [System\\CurrentControlSet\\Services\\Class\\NetTrans\\0000] "IPAddress"="10.0.10.100" The thought occurred to me that maybe the tool the builds the registry during wine install could actually create these keys - since it is essentially a key part of the system (and other similar keys are also built in the same way). I don't think I have the skills to do it myself yet. Alan alan(a)chandlerfamily.org.uk http://www.chandler.u-net.com

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Wine Press
by Eric Pouech 05 Mar '01

05 Mar '01

http://linux.cnet.com/linux/0-2136864-7-4961586.html worth the reading, even if Wine gets the lowest ranking my reading of it is that Wine is not yet a product (compared to the two others). I definitively think we should focus more on a release target. It of course means that we have to make choices (do not include some functionnalities), spend pretty much more time on testing... but that's the way to go if we want to have Wine 1.0 around on of these days A+ --------------- Eric Pouech (http://perso.wanadoo.fr/eric.pouech/) "The future will be better tomorrow", Vice President Dan Quayle

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