terminal/src/host
Michael Niksa f087d03eb2
Reduce Transient Allocations during Bulk Text Output (#8617)
Make a few changes to memory usage throughout the application to reduce transient allocations from the `big.txt` test from ~213,000 to ~53,000.

## PR Checklist
* [x] Supports #3075
* [x] I work here.
* [x] Tested manually and WPR'd. Test suite should still pass.
* [x] Am core contributor

## Detailed Description of the Pull Request / Additional comments

Transient allocations are those that are new'd, used, then delete'd. Going back and forth to the system allocator for things we're just going to throw away or use rapidly again is a performance detriment. Not only is it a bunch of time to go ask the system with a syscall, it also hits a whole bunch of locks on the allocators. This PR identifies a few places where we were accidentally allocating and didn't mean to or were allocating and freeing just to turn around and allocate again. I chose other strategies to avoid this.

## Validation Steps Performed
- Ran `big.txt` sample (~6MB file) before and after. Observed heap allocations with WPR.
2021-01-05 18:06:06 +00:00
..
dll Unify and clean up the common build properties (#3429) 2019-11-05 14:29:11 -08:00
exe Change backslashes in include statements to forward slashes (#8205) 2020-11-25 21:02:10 +00:00
ft_host Fix the feature tests with a retry (#8534) 2020-12-09 11:02:23 -08:00
ft_integrity Fix a bunch of spelling errors across the project (#4295) 2020-02-10 20:40:01 +00:00
ft_uia Change backslashes in include statements to forward slashes (#8205) 2020-11-25 21:02:10 +00:00
lib Migrate Search module as a shared component for Terminal Search (#3279) 2019-11-14 14:36:41 -08:00
ut_host Greatly reduce allocations in the conhost/OpenConsole startup path (#8489) 2020-12-16 10:40:30 -08:00
ut_lib Unify and clean up the common build properties (#3429) 2019-11-05 14:29:11 -08:00
_output.cpp Replace basic_string_view<T> with span<const T> (#6921) 2020-07-15 16:40:42 +00:00
_output.h Initial release of the Windows Terminal source code 2019-05-02 15:29:04 -07:00
_stream.cpp Change backslashes in include statements to forward slashes (#8205) 2020-11-25 21:02:10 +00:00
_stream.h Change backslashes in include statements to forward slashes (#8205) 2020-11-25 21:02:10 +00:00
alias.cpp Change backslashes in include statements to forward slashes (#8205) 2020-11-25 21:02:10 +00:00
alias.h add clang-format conf to the project, format the c++ code (#1141) 2019-06-11 13:27:09 -07:00
ApiRoutines.h Change backslashes in include statements to forward slashes (#8205) 2020-11-25 21:02:10 +00:00
cmdline.cpp Change backslashes in include statements to forward slashes (#8205) 2020-11-25 21:02:10 +00:00
cmdline.h Improve the legacy color conversions (#6358) 2020-06-08 19:05:06 +00:00
CommandListPopup.cpp Change backslashes in include statements to forward slashes (#8205) 2020-11-25 21:02:10 +00:00
CommandListPopup.hpp add clang-format conf to the project, format the c++ code (#1141) 2019-06-11 13:27:09 -07:00
CommandNumberPopup.cpp Change backslashes in include statements to forward slashes (#8205) 2020-11-25 21:02:10 +00:00
CommandNumberPopup.hpp Add explicit identifier to some constructors (#5652) 2020-04-29 16:50:47 -07:00
conapi.h Change backslashes in include statements to forward slashes (#8205) 2020-11-25 21:02:10 +00:00
conareainfo.cpp Replace basic_string_view<T> with span<const T> (#6921) 2020-07-15 16:40:42 +00:00
conareainfo.h Improve the legacy color conversions (#6358) 2020-06-08 19:05:06 +00:00
conattrs.cpp Change backslashes in include statements to forward slashes (#8205) 2020-11-25 21:02:10 +00:00
conddkrefs.h add clang-format conf to the project, format the c++ code (#1141) 2019-06-11 13:27:09 -07:00
conhost.rcv Initial release of the Windows Terminal source code 2019-05-02 15:29:04 -07:00
conhostv2_traceviewpp.tvpp Initial release of the Windows Terminal source code 2019-05-02 15:29:04 -07:00
conimeinfo.cpp Make sure we don't hide the cursor until the IME starts (#7673) 2020-09-18 19:25:39 +00:00
conimeinfo.h Replace basic_string_view<T> with span<const T> (#6921) 2020-07-15 16:40:42 +00:00
conserv.h add clang-format conf to the project, format the c++ code (#1141) 2019-06-11 13:27:09 -07:00
ConsoleArguments.cpp Add support for win32-input-mode to conhost, ConPTY, Terminal (#6309) 2020-06-08 22:31:28 +00:00
ConsoleArguments.hpp Add support for win32-input-mode to conhost, ConPTY, Terminal (#6309) 2020-06-08 22:31:28 +00:00
consoleInformation.cpp Change backslashes in include statements to forward slashes (#8205) 2020-11-25 21:02:10 +00:00
conv.h add clang-format conf to the project, format the c++ code (#1141) 2019-06-11 13:27:09 -07:00
convarea.cpp Make sure we don't hide the cursor until the IME starts (#7673) 2020-09-18 19:25:39 +00:00
conwinuserrefs.h add clang-format conf to the project, format the c++ code (#1141) 2019-06-11 13:27:09 -07:00
CopyFromCharPopup.cpp add clang-format conf to the project, format the c++ code (#1141) 2019-06-11 13:27:09 -07:00
CopyFromCharPopup.hpp Add explicit identifier to some constructors (#5652) 2020-04-29 16:50:47 -07:00
CopyToCharPopup.cpp add clang-format conf to the project, format the c++ code (#1141) 2019-06-11 13:27:09 -07:00
CopyToCharPopup.hpp add clang-format conf to the project, format the c++ code (#1141) 2019-06-11 13:27:09 -07:00
CursorBlinker.cpp Add support for the "blink" graphic rendition attribute (#7490) 2020-09-21 23:21:33 +00:00
CursorBlinker.hpp Initial release of the Windows Terminal source code 2019-05-02 15:29:04 -07:00
dbcs.cpp Replace gsl::at with a new til::at(span) for pre-checked bounds (#6925) 2020-07-15 10:29:36 -07:00
dbcs.h add clang-format conf to the project, format the c++ code (#1141) 2019-06-11 13:27:09 -07:00
directio.cpp Change backslashes in include statements to forward slashes (#8205) 2020-11-25 21:02:10 +00:00
directio.h Switch all DSR responses to appending instead of prepending (#7583) 2020-09-09 23:55:22 +00:00
dirs Initial release of the Windows Terminal source code 2019-05-02 15:29:04 -07:00
exemain.cpp Change backslashes in include statements to forward slashes (#8205) 2020-11-25 21:02:10 +00:00
getset.cpp Correct horizontal coordinates in viewport overflow test (#8456) 2020-12-03 21:53:16 +00:00
getset.h OSC 8 support for conhost and terminal (#7251) 2020-09-03 13:52:39 -04:00
globals.cpp Implement a pair of shims for cls, Clear-Host in conpty mode (#5627) 2020-04-30 21:53:31 +00:00
globals.h Convert DeviceComm into an interface and add handle exchange (#8367) 2020-12-15 23:07:43 +00:00
handle.cpp Change backslashes in include statements to forward slashes (#8205) 2020-11-25 21:02:10 +00:00
handle.h Initial release of the Windows Terminal source code 2019-05-02 15:29:04 -07:00
history.cpp Change backslashes in include statements to forward slashes (#8205) 2020-11-25 21:02:10 +00:00
history.h Replace macros with constexpr part 2 (#3416) 2019-11-04 07:37:47 -06:00
host-common.vcxitems Migrate Search module as a shared component for Terminal Search (#3279) 2019-11-14 14:36:41 -08:00
IIoProvider.hpp Fix a bunch of spelling errors across the project (#4295) 2020-02-10 20:40:01 +00:00
init.cpp add clang-format conf to the project, format the c++ code (#1141) 2019-06-11 13:27:09 -07:00
init.hpp Initial release of the Windows Terminal source code 2019-05-02 15:29:04 -07:00
input.cpp Change backslashes in include statements to forward slashes (#8205) 2020-11-25 21:02:10 +00:00
input.h Replace macros with constexpr part 2 (#3416) 2019-11-04 07:37:47 -06:00
inputBuffer.cpp Change backslashes in include statements to forward slashes (#8205) 2020-11-25 21:02:10 +00:00
inputBuffer.hpp Move MouseInput from TermAdapter to TermInput (#4848) 2020-03-12 22:25:43 +00:00
inputKeyInfo.cpp Initial release of the Windows Terminal source code 2019-05-02 15:29:04 -07:00
inputReadHandleData.cpp add clang-format conf to the project, format the c++ code (#1141) 2019-06-11 13:27:09 -07:00
inputReadHandleData.h add clang-format conf to the project, format the c++ code (#1141) 2019-06-11 13:27:09 -07:00
misc.cpp Change backslashes in include statements to forward slashes (#8205) 2020-11-25 21:02:10 +00:00
misc.h add clang-format conf to the project, format the c++ code (#1141) 2019-06-11 13:27:09 -07:00
ntprivapi.cpp Change NULL to nullptr since they are pointers (#4960) 2020-03-20 20:35:12 +00:00
ntprivapi.hpp add clang-format conf to the project, format the c++ code (#1141) 2019-06-11 13:27:09 -07:00
output.cpp Improve conpty rendering of default colors in legacy apps (#6698) 2020-07-01 11:08:30 -07:00
output.h add clang-format conf to the project, format the c++ code (#1141) 2019-06-11 13:27:09 -07:00
outputStream.cpp Switch all DSR responses to appending instead of prepending (#7583) 2020-09-09 23:55:22 +00:00
outputStream.hpp Change backslashes in include statements to forward slashes (#8205) 2020-11-25 21:02:10 +00:00
popup.cpp Change backslashes in include statements to forward slashes (#8205) 2020-11-25 21:02:10 +00:00
popup.h Improve the legacy color conversions (#6358) 2020-06-08 19:05:06 +00:00
precomp.cpp Initial release of the Windows Terminal source code 2019-05-02 15:29:04 -07:00
precomp.h Reduce Transient Allocations during Bulk Text Output (#8617) 2021-01-05 18:06:06 +00:00
PtySignalInputThread.cpp Change backslashes in include statements to forward slashes (#8205) 2020-11-25 21:02:10 +00:00
PtySignalInputThread.hpp Revert locking changes (#3488) 2019-11-08 13:44:52 -08:00
readData.cpp Initial release of the Windows Terminal source code 2019-05-02 15:29:04 -07:00
readData.hpp add clang-format conf to the project, format the c++ code (#1141) 2019-06-11 13:27:09 -07:00
readDataCooked.cpp Change backslashes in include statements to forward slashes (#8205) 2020-11-25 21:02:10 +00:00
readDataCooked.hpp add clang-format conf to the project, format the c++ code (#1141) 2019-06-11 13:27:09 -07:00
readDataDirect.cpp Change backslashes in include statements to forward slashes (#8205) 2020-11-25 21:02:10 +00:00
readDataDirect.hpp add clang-format conf to the project, format the c++ code (#1141) 2019-06-11 13:27:09 -07:00
readDataRaw.cpp Change backslashes in include statements to forward slashes (#8205) 2020-11-25 21:02:10 +00:00
readDataRaw.hpp Initial release of the Windows Terminal source code 2019-05-02 15:29:04 -07:00
registry.cpp Change backslashes in include statements to forward slashes (#8205) 2020-11-25 21:02:10 +00:00
registry.hpp add clang-format conf to the project, format the c++ code (#1141) 2019-06-11 13:27:09 -07:00
renderData.cpp Change backslashes in include statements to forward slashes (#8205) 2020-11-25 21:02:10 +00:00
renderData.hpp Change backslashes in include statements to forward slashes (#8205) 2020-11-25 21:02:10 +00:00
renderFontDefaults.cpp Allow FontInfo{,Base,Desired} to store a font name > 32 wch (#3107) 2019-10-14 21:23:45 -07:00
renderFontDefaults.hpp Change backslashes in include statements to forward slashes (#8205) 2020-11-25 21:02:10 +00:00
res.rc Initial release of the Windows Terminal source code 2019-05-02 15:29:04 -07:00
resource.h add clang-format conf to the project, format the c++ code (#1141) 2019-06-11 13:27:09 -07:00
runft.bat Initial release of the Windows Terminal source code 2019-05-02 15:29:04 -07:00
runtests.bat Initial release of the Windows Terminal source code 2019-05-02 15:29:04 -07:00
runut.bat Initial release of the Windows Terminal source code 2019-05-02 15:29:04 -07:00
ScreenBufferRenderTarget.cpp add clang-format conf to the project, format the c++ code (#1141) 2019-06-11 13:27:09 -07:00
ScreenBufferRenderTarget.hpp add clang-format conf to the project, format the c++ code (#1141) 2019-06-11 13:27:09 -07:00
screenInfo.cpp Retain horizontal viewport offset when moving to bottom (#8434) 2020-11-30 19:58:03 +00:00
screenInfo.hpp Reintroduce a color compatibility hack, but only for PowerShells (#6810) 2020-07-10 15:25:39 -07:00
scrolling.cpp Change backslashes in include statements to forward slashes (#8205) 2020-11-25 21:02:10 +00:00
scrolling.hpp Initial release of the Windows Terminal source code 2019-05-02 15:29:04 -07:00
selection.cpp Move rect expansion to textbuffer; refactor selection code (#4560) 2020-02-27 16:42:26 -08:00
selection.hpp Change backslashes in include statements to forward slashes (#8205) 2020-11-25 21:02:10 +00:00
selectionInput.cpp Fix color selection operations in conhost (#8577) 2020-12-14 19:45:49 +00:00
selectionState.cpp Change backslashes in include statements to forward slashes (#8205) 2020-11-25 21:02:10 +00:00
server.h Change backslashes in include statements to forward slashes (#8205) 2020-11-25 21:02:10 +00:00
settings.cpp Change backslashes in include statements to forward slashes (#8205) 2020-11-25 21:02:10 +00:00
settings.hpp Add support for the "blink" graphic rendition attribute (#7490) 2020-09-21 23:21:33 +00:00
sources.inc Merged PR 4988918: Reflect OS changes for LKG10 2020-07-30 22:55:57 +00:00
sources.test.inc Initial release of the Windows Terminal source code 2019-05-02 15:29:04 -07:00
srvinit.cpp Convert DeviceComm into an interface and add handle exchange (#8367) 2020-12-15 23:07:43 +00:00
srvinit.h add clang-format conf to the project, format the c++ code (#1141) 2019-06-11 13:27:09 -07:00
stream.cpp Change backslashes in include statements to forward slashes (#8205) 2020-11-25 21:02:10 +00:00
stream.h Change backslashes in include statements to forward slashes (#8205) 2020-11-25 21:02:10 +00:00
telemetry.cpp Change backslashes in include statements to forward slashes (#8205) 2020-11-25 21:02:10 +00:00
telemetry.hpp Change backslashes in include statements to forward slashes (#8205) 2020-11-25 21:02:10 +00:00
tracing.cpp Reduce Transient Allocations during Bulk Text Output (#8617) 2021-01-05 18:06:06 +00:00
tracing.hpp Reduce Transient Allocations during Bulk Text Output (#8617) 2021-01-05 18:06:06 +00:00
utf8ToWideCharParser.cpp Fix a bunch of spelling errors across the project (#4295) 2020-02-10 20:40:01 +00:00
utf8ToWideCharParser.hpp add clang-format conf to the project, format the c++ code (#1141) 2019-06-11 13:27:09 -07:00
utils.cpp Change backslashes in include statements to forward slashes (#8205) 2020-11-25 21:02:10 +00:00
utils.hpp Change backslashes in include statements to forward slashes (#8205) 2020-11-25 21:02:10 +00:00
VtInputThread.cpp Enable Passthrough for VT Input Mode in ConPty (#4856) 2020-03-10 22:07:14 +00:00
VtInputThread.hpp Change backslashes in include statements to forward slashes (#8205) 2020-11-25 21:02:10 +00:00
VtIo.cpp Improve the propagation of color attributes over ConPTY (#6506) 2020-07-01 11:10:36 -07:00
VtIo.hpp Change backslashes in include statements to forward slashes (#8205) 2020-11-25 21:02:10 +00:00
writeData.cpp Change backslashes in include statements to forward slashes (#8205) 2020-11-25 21:02:10 +00:00
writeData.hpp Reintroduce a color compatibility hack, but only for PowerShells (#6810) 2020-07-10 15:25:39 -07:00