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a_h_k
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PostPosted: July 5th, 2010, 11:59 am 
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Posts: 643
Have you got NtQuerySystemInformation() working? (i have)

Edit: It seems that i have NtSetSystemInformation() working. I have task manager up, and when run my test script the Firefox memory usage drops a bit :?::?:

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strictlyfocused02
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PostPosted: July 5th, 2010, 2:25 pm 
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Joined: January 21st, 2009, 1:06 pm
Posts: 63
a_h_k wrote:
Have you got NtQuerySystemInformation() working? (i have)

Edit: It seems that i have NtSetSystemInformation() working. I have task manager up, and when run my test script the Firefox memory usage drops a bit :?::?:


Negative, I havent been able to make any head way other than what mouser helped me with. Mind sharing your source? :)

If you use CacheSet from sysinternals you will be able to monitor your system file cache. The relevant section is under the "Cache Information" groupbox. If your script is working you should see the "Current Size" field drop significantly and then start filling back up.


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a_h_k
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PostPosted: July 5th, 2010, 3:43 pm 
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Joined: February 2nd, 2008, 4:35 am
Posts: 643
To read the system info i used...
Code:
; Constant
SYSTEM_INFO_CLASS = 0x15

; Set buffer size
SystemInfoLength = 36
VarSetCapacity(SystemCacheInfo, SystemInfoLength, 0)      

; DLL call
DllCall("C:\Windows\system32\ntdll.dll\NtQuerySystemInformation",  "UInt",SYSTEM_INFO_CLASS,  "UInt",&SystemCacheInfo,  "UInt",SystemInfoLength)

; Read values
CurrentSize := NumGet(SystemCacheInfo, 0, "UInt")
PeakSize := NumGet(SystemCacheInfo, 4, "UInt")
PageFaultCount := NumGet(SystemCacheInfo, 8, "UInt")
MinimumWorkingSet := NumGet(SystemCacheInfo, 12, "UInt")
MaximumWorkingSet := NumGet(SystemCacheInfo, 16, "UInt")
TransitionSharedPages := NumGet(SystemCacheInfo, 20, "UInt")
PeakTransitionSharedPages := NumGet(SystemCacheInfo, 24, "UInt")
:)

As for writing...
Did the test with CacheSet .. and no unfortunately it did not act like the "Clear" button (what i saw before must have been just a random drop in memory) :(

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a_h_k
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PostPosted: July 5th, 2010, 6:00 pm 
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Joined: February 2nd, 2008, 4:35 am
Posts: 643
After a bit of "detective work" i worked out that some "bit-shifting" was required (to give the correct values - as displayed in CacheSet)...
Code:
; Constant
SYSTEM_INFO_CLASS = 0x15

; Set buffer size
SystemInfoLength = 36
VarSetCapacity(SystemCacheInfo, SystemInfoLength, 0)      

; DLL call
DllCall("C:\Windows\system32\ntdll.dll\NtQuerySystemInformation",  "UInt",SYSTEM_INFO_CLASS,  "UInt",&SystemCacheInfo,  "UInt",SystemInfoLength)

; Read values
CurrentSize := NumGet(SystemCacheInfo, 0, "UInt")
PeakSize := NumGet(SystemCacheInfo, 4, "UInt")
PageFaultCount := NumGet(SystemCacheInfo, 8, "UInt")
MinimumWorkingSet := NumGet(SystemCacheInfo, 12, "UInt")
MaximumWorkingSet := NumGet(SystemCacheInfo, 16, "UInt")
TransitionSharedPages := NumGet(SystemCacheInfo, 20, "UInt")
PeakTransitionSharedPages := NumGet(SystemCacheInfo, 24, "UInt")

; Tweak values to make correct
CurrentSize /= 1024
PeakSize /= 1024
MinimumWorkingSet *= 4
MaximumWorkingSet *= 4
TransitionSharedPages *= 4
PeakTransitionSharedPages *= 4
:D

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Last edited by a_h_k on July 5th, 2010, 8:15 pm, edited 1 time in total.

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strictlyfocused02
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PostPosted: July 5th, 2010, 6:12 pm 
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Joined: January 21st, 2009, 1:06 pm
Posts: 63
a_h_k wrote:
After a bit of "detective work" i worked out that some "bit-shifting" was required (to give the correct values - as displayed in CacheSet)
a_h_k wrote:
To read the system info i used...
Code:
; Constant
SYSTEM_INFO_CLASS = 0x15

; Set buffer size
SystemInfoLength = 36
VarSetCapacity(SystemCacheInfo, SystemInfoLength, 0)      

; DLL call
DllCall("C:\Windows\system32\ntdll.dll\NtQuerySystemInformation",  "UInt",SYSTEM_INFO_CLASS,  "UInt",&SystemCacheInfo,  "UInt",SystemInfoLength)

; Read values
CurrentSize := NumGet(SystemCacheInfo, 0, "UInt")
PeakSize := NumGet(SystemCacheInfo, 4, "UInt")
PageFaultCount := NumGet(SystemCacheInfo, 8, "UInt")
MinimumWorkingSet := NumGet(SystemCacheInfo, 12, "UInt")
MaximumWorkingSet := NumGet(SystemCacheInfo, 16, "UInt")
TransitionSharedPages := NumGet(SystemCacheInfo, 20, "UInt")
PeakTransitionSharedPages := NumGet(SystemCacheInfo, 24, "UInt")

; Tweak values to make correct
CurrentSize /= 1024
PeakSize /= 1024
MinimumWorkingSet *= 4
MaximumWorkingSet *= 4
TransitionSharedPages *= 4
PeakTransitionSharedPages *= 4
:D


You, sir, are a gentleman and a scholar. Thank you for providing your source code! Im going to play around with it this afternoon and see if I can get NtSetSystemInformation() to work based on your examples.


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