Performance issues -- xdvi

[Marciano Siniscalchi]

Running: cygwin 1.5.5-1, XFree 4.3.0 on WinXP in rootless or fullscreen 
mode; xwin.log file below.

I have been playing around with xdvi from the latest tetex distribution, 
mainly to see if whizzytex (an almost-instant preview package for 
emacs/latex/xdvi) could be made to work under Cygwin.

I have found xdvi to be vastly slower under Cygwin/Xfree than under 
Linux/Xfree. Displaying a new page takes about 1--1.5 seconds on my P4 
2.8 Ghz / 512MB PC. You can see text being displayed almost line by 
line. This happens both in "rootless" and "fullscreen" mode. Under 
Linux/Xfree, it's almost instantaneous. Under Linux Xfree, xdvi is known 
to be pretty fast (faster than Yap under Win32, say).

I should emphasize that, although my goal was to get whizzytex to work, 
speed considerations arise when simply previewing a DVI file, by typing 
xdvi file.dvi at the bash prompt and then paging through the file with 
the keyboard.

I first thought this was due to the Cygwin port of xwin, or to Cygwin 
proper, not Cygwin/Xfree. However, I eventually tried the Xwin32 X 
server, and was surprised to find out that performance is greatly 
improved, very close to "native".

So, the issue seems to be with Cygwin/Xfree. Indeed, I also found out 
that other X clients (xterm, emacs) are much snappier under Xwin32 than 
under Cygwin/Xfree.

Now, this could be a misconfiguration issue. My xwin.log file is 
attached below. I also export DISPLAY=<my machine' IP address>:0 before 
running clients. [I have also tried DISPLAY=127.0.0.1:0, but observed no 
change in performance, although I recall seeing a thread on the ML 
concerning possible differneces]

Otherwise, does anybody have any thoughts? This is probably not a huge 
issue for many clients, but the instant-preview nature of whizzytex 
makes speed essential (basically, you need to refresh a DVI file every 
few keystrokes).

Thanks!
Marciano.

xwin.log file: (running in rootless mode)

ddxProcessArgument - Initializing default screens
winInitializeDefaultScreens - w 1280 h 1024
winInitializeDefaultScreens - Returning
OsVendorInit - Creating bogus screen 0
(EE) Unable to locate/open config file
InitOutput - Error reading config file
winDetectSupportedEngines - Windows NT/2000/XP
winDetectSupportedEngines - DirectDraw installed
winDetectSupportedEngines - Allowing PrimaryDD
winDetectSupportedEngines - DirectDraw4 installed
winDetectSupportedEngines - Returning, supported engines 0000001f
InitOutput - g_iNumScreens: 1 iMaxConsecutiveScreen: 1
winSetEngine - Multi Window => ShadowGDI
winAdjustVideoModeShadowGDI - Using Windows display depth of 32 bits per 
pixel
winCreateBoundingWindowWindowed - User w: 1280 h: 1024
winCreateBoundingWindowWindowed - Current w: 1280 h: 1024
winAdjustForAutoHide - Original WorkArea: 0 0 994 1280
winAdjustForAutoHide - Adjusted WorkArea: 0 0 994 1280
winCreateBoundingWindowWindowed - WindowClient w 1280 h 994 r 1280 l 0 b 
994 t 0
winCreateBoundingWindowWindowed -  Returning
winAllocateFBShadowGDI - Creating DIB with width: 1280 height: 994 depth: 32
winAllocateFBShadowGDI - Dibsection width: 1280 height: 994 depth: 32 
size image: 5089280
winAllocateFBShadowGDI - Created shadow stride: 1280
winFinishScreenInitFB - Masks: 00ff0000 0000ff00 000000ff
winInitVisualsShadowGDI - Masks 00ff0000 0000ff00 000000ff BPRGB 8 d 24 
bpp 32
winCreateDefColormap - Deferring to fbCreateDefColormap ()
null screen fn ReparentWindow
null screen fn RestackWindow
winFinishScreenInitFB - Calling winInitWM.
InitQueue - Calling pthread_mutex_init
InitQueue - pthread_mutex_init returned
InitQueue - Calling pthread_cond_init
InitQueue - pthread_cond_init returned
winInitWM - Returning.
winFinishScreenInitFB - returning
winScreenInit - returning
InitOutput - Returning.
winInitMultiWindowWM - Hello
winInitMultiWindowWM - Calling pthread_mutex_lock ()
winMultiWindowXMsgProc - Hello
winMultiWindowXMsgProc - Calling pthread_mutex_lock ()
(==) winConfigKeyboard - Layout: "00000409" (00000409)
(EE) No primary keyboard configured
(==) Using compiletime defaults for keyboard
Rules = "xfree86" Model = "pc101" Layout = "us" Variant = "(null)" 
Options = "(null)"
winPointerWarpCursor - Discarding first warp: 640 497
winBlockHandler - Releasing pmServerStarted
winInitMultiWindowWM - pthread_mutex_lock () returned.
DetectUnicodeSupport - Windows NT/2000/XP
winInitMultiWindowWM - Calling setlocale ()
winBlockHandler - pthread_mutex_unlock () returned
winInitMultiWindowWM - setlocale () returned
winInitMultiWindowWM - XInitThreads () returned.
winMultiWindowXMsgProc - pthread_mutex_lock () returned.
winMultiWindowXMsgProc - pthread_mutex_unlock () returned.
winMultiWindowXMsgProc - DISPLAY=127.0.0.1:0.0
winInitMultiWindowWM - pthread_mutex_unlock () returned.
winInitMultiWindowWM - DISPLAY=127.0.0.1:0.0
winMultiWindowXMsgProc - XOpenDisplay () returned and successfully 
opened the display.
winInitMultiWindowWM - XOpenDisplay () returned and successfully opened 
the display.
winDeinitClipboard - Noting shutdown in progress
winDeinitMultiWindowWM - Noting shutdown in progress
winDeinitClipboard - Noting shutdown in progress
winDeinitMultiWindowWM - Noting shutdown in progress


-- 
Marciano Siniscalchi     Ph  (847) 491-5398
Department of Economics  Fax (847) 491-7001
Northwestern University
http://www.faculty.econ.northwestern.edu/faculty/siniscalchi