full drmem MUCH slower than addronly in some cases: > 20x

_From [bruen...@google.com](https://code.google.com/u/109494838902877177630/) on November 10, 2011 11:29:03_

bears investigation: is it encoding of all the instru?

native:
[ OK ] Bzip2Test.Roundtrip (16 ms)
0.00user 0.00system 0:00.15elapsed 0%CPU (0avgtext+0avgdata 214784maxresident)k

plain DR:
[ OK ] Bzip2Test.Roundtrip (31 ms)
0.00user 0.01system 0:01.48elapsed 1%CPU (0avgtext+0avgdata 214784maxresident)k

full drmem:
[ OK ] Bzip2Test.Roundtrip (391 ms)
[----------] 1 test from Bzip2Test (1047 ms total)
0.00user 0.01system 3:22.78elapsed 0%CPU (0avgtext+0avgdata 214016maxresident)k

I have some data from CodeAnalyst but no good conclusions yet.

also from issue #622 :

% ~/drmemory/git/build_drmemory/bin/drmemory.exe -no_count_leaks -batch -callstack_style 0xf -dr c:/src/dr/git/exports -- ./base_unittests.exe --gtest_filter="ToolsSanityTest.AccessesToNewMemory"
[ RUN ] ToolsSanityTest.AccessesToNewMemory
[ OK ] ToolsSanityTest.AccessesToNewMemory (101 ms)
[----------] 1 test from ToolsSanityTest (510 ms total)
[==========] 1 test from 1 test case ran. (1563 ms total)
[ PASSED ] 1 test.

% ~/drmemory/git/build_drmemory/bin/drmemory.exe -no_check_uninitialized -no_count_leaks -batch -callstack_style 0xf -dr c:/src/dr/git/exports -- ./base_unittests.exe --gtest_filter="ToolsSanityTest.AccessesToNewMemory"
[ RUN ] ToolsSanityTest.AccessesToNewMemory
[ OK ] ToolsSanityTest.AccessesToNewMemory (11 ms)
[==========] 1 test from 1 test case ran. (88 ms total)
[ PASSED ] 1 test.

_Original issue: http://code.google.com/p/drmemory/issues/detail?id=681_