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在 CMD.exe 中，「start sh.exe」會建立一個佔用 700 MB 記憶體的 conhost 進程

tag-icon • tag-icon windows-10 memory cmd.exe git-bash conhost
在 CMD.exe 中，「start sh.exe」會建立一個佔用 700 MB 記憶體的 conhost 進程

Git bash (sh.exe) 佔用的記憶體很少，但當使用 CMDstart sh.exe命令啟動時，它會建立一個佔用 3-700 MB 記憶體的 conhost.exe 進程。

有趣的是，start cmd /k sh.exe它做了同樣的事情，但它創建的 conhost 進程只需要 8 MB。

為什麼使用「start」指令啟動 sh.exe 會建立一個佔用更多記憶體的 conhost 進程？

答案1

好的，我都看了使用 WPA.exe 進行追蹤。在顯示高記憶體使用率的追蹤中，記憶體使用量來自建立螢幕緩衝區DoCreateScreenBuffer：

Line #, Process, Commit Stack, Address, Count, Impacting Size, Size
1, conhost.exe (10848), [Root], , 46, 800784384, 800833536
2, ,    |- ntdll.dll!RtlUserThreadStart, , 31, 800669696, 800673792
3, ,    |    kernel32.dll!BaseThreadInitThunk, , 31, 800669696, 800673792
4, ,    |    |- ConhostV2.dll!ConsoleIoThread, , 13, 800509952, 800509952
5, ,    |    |    ConhostV2.dll!ConsoleHandleConnectionRequest, , 13, 800509952, 800509952
6, ,    |    |    ConhostV2.dll!ConsoleAllocateConsole, , 13, 800509952, 800509952
7, ,    |    |    |- ConhostV2.dll!SetUpConsole, , 10, 800460800, 800460800
8, ,    |    |    |    |- ConhostV2.dll!AllocateConsole, , 7, 800432128, 800432128
9, ,    |    |    |    |    ConhostV2.dll!DoCreateScreenBuffer, , 7, 800432128, 800432128
10, ,   |    |    |    |    |- ConhostV2.dll!SCREEN_INFORMATION::CreateInstance, , 6, 800415744, 800415744
11, ,   |    |    |    |    |    ConhostV2.dll!TEXT_BUFFER_INFO::CreateInstance, , 6, 800415744, 800415744
12, ,   |    |    |    |    |    |- ConhostV2.dll!DBCS_SCREEN_BUFFER::CreateInstance, , 4, 599891968, 599891968
13, ,   |    |    |    |    |    |    ntdll.dll!RtlpAllocateHeapInternal, , 4, 599891968, 599891968
14, ,   |    |    |    |    |    |    ntdll.dll!RtlpAllocateHeap, , 4, 599891968, 599891968
15, ,   |    |    |    |    |    |    ntdll.dll!NtAllocateVirtualMemory, , 4, 599891968, 599891968
16, ,   |    |    |    |    |    |    ntoskrnl.exe!KiSystemServiceCopyEnd, , 4, 599891968, 599891968
17, ,   |    |    |    |    |    |    ntoskrnl.exe!NtAllocateVirtualMemory, , 4, 599891968, 599891968
18, ,   |    |    |    |    |    |    ntoskrnl.exe! ?? ::NNGAKEGL::`string', , 4, 599891968, 599891968

一是start cmd /k sh.exe不進行記憶體分配。這裡只印了一些字符，只使用了 69kB。

Line #, Process, Commit Stack, Address, Count, Impacting Size, Size
7, conhost.exe (10072), [Root], , 2, 81920, 81920
8, ,   ntdll.dll!RtlUserThreadStart, , 2, 81920, 81920
9, ,   kernel32.dll!BaseThreadInitThunk, , 2, 81920, 81920
10, ,   |- ConhostV2.dll!ConsoleIoThread, , 1, 69632, 69632
11, ,   |    ConhostV2.dll!SrvWriteConsole, , 1, 69632, 69632
12, ,   |    ConhostV2.dll!DoSrvWriteConsole, , 1, 69632, 69632
13, ,   |    ConhostV2.dll!DoWriteConsole, , 1, 69632, 69632
14, ,   |    ConhostV2.dll!WriteChars, , 1, 69632, 69632
15, ,   |    ConhostV2.dll!WriteCharsLegacy, , 1, 69632, 69632
16, ,   |    ConhostV2.dll!WriteRegionToScreen, , 1, 69632, 69632
17, ,   |    ConhostV2.dll!ConsolePolyTextOut, , 1, 69632, 69632
18, ,   |    ntdll.dll!RtlpAllocateHeapInternal, , 1, 69632, 69632
19, ,   |    ntdll.dll!RtlpAllocateHeap, , 1, 69632, 69632
20, ,   |    ntdll.dll!RtlpCommitBlock, , 1, 69632, 69632
21, ,   |    ntdll.dll!NtAllocateVirtualMemory, , 1, 69632, 69632
22, ,   |    ntoskrnl.exe!KiSystemServiceCopyEnd, , 1, 69632, 69632
23, ,   |    ntoskrnl.exe!NtAllocateVirtualMemory, , 1, 69632, 69632
24, ,   |    ntoskrnl.exe! ?? ::NNGAKEGL::`string', , 1, 69632, 69632
25, ,   |  , 0x2a657431000, 1, 69632, 69632

但我不知道為什麼會發生這種情況。始終使用 start cmd /k 運行它。

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