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QTC: cache get_env results for improved performance

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It turns out that QUtil::get_env is particularly expensive on Windows
if there is a large environment. This may be true on other platforms
as well.
This commit is contained in:
Jay Berkenbilt 2022-08-07 14:23:05 -04:00
parent 32e30a3af2
commit da71dc6f37
2 changed files with 12 additions and 2 deletions
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2
TODO
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@ -10,6 +10,8 @@ Before Release:
* Cache environment variables
* Remove coverage cases for things that are heavily exercised or are
in critical paths
* Make ./performance_check usable by other people by having published
files to use for testing.
* Evaluate issues tagged with `next`
* Stay on top of https://github.com/pikepdf/pikepdf/pull/315

12
libqpdf/QTC.cc
View File

@ -2,6 +2,7 @@
#include <qpdf/QUtil.hh>
#include <set>
#include <map>
#include <stdio.h>
static bool
@ -14,12 +15,19 @@ tc_active(char const* const scope)
void
QTC::TC(char const* const scope, char const* const ccase, int n)
{
static std::set<std::pair<std::string, int>> cache;
static std::map<std::string, bool> active;
auto is_active = active.find(scope);
if (is_active == active.end()) {
active[scope] = tc_active(scope);
is_active = active.find(scope);
}
if (!tc_active(scope)) {
if (!is_active->second) {
return;
}
static std::set<std::pair<std::string, int>> cache;
std::string filename;
#ifdef _WIN32
# define TC_ENV "TC_WIN_FILENAME"