Skip to content

⚡ Bolt: [performance improvement] String Tahsis ve Bellek Optimizasyonları #49

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Open
gitmuhammedalbayrak wants to merge 1 commit into
base: master
Choose a base branch
from
Open

⚡ Bolt: [performance improvement] String Tahsis ve Bellek Optimizasyonları #49

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
3 changes: 3 additions & 0 deletions .jules/bolt.md
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -12,3 +12,6 @@
## 2026-05-12 - [Remove Duplicate Static Initialization & Unsafe String Operations]
**Learning:** The previous optimization attempt introduced a bug where 'cached_nodes' was initialized twice as different types (one array of xml_node pointers, one array of const char*). Moreover, directly casting const char* returned from pugixml without assigning to std::string when used in ternary operations can cause operand type mismatches.
**Action:** Removed the redundant array initialization block and cast the char* obtained via `pt.text().get()` from the single cached xml_node array to `std::string` inside the ternary conditional to prevent implicit conversion mismatches.
## 2026-05-27 - [C++ String Allocation Performance]
**Learning:** In C++, frequently calling `std::to_string()` and chaining string concatenation via `+` causes multiple short-lived heap allocations, creating a measurable performance regression. Similarly, using `.append()` in a class method that is called repeatedly on the same object state causes unbounded memory growth and severe performance penalties.
**Action:** Replace `std::to_string` and `+` concatenations with fixed-size stack arrays (`char buffer[N]`) and `std::snprintf()` for building formatted strings. Always prefer direct assignment (`=`) over `.append()` when rebuilding internal string state to avoid memory leaks.
Binary file removed run_tests
View file
Open in desktop
Binary file not shown.
50 changes: 25 additions & 25 deletions src/src-class/Zaman.cpp
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -70,7 +70,12 @@ unsigned int zaman::vakt_to_td(const std::string& vakt)

std::string zaman::td_to_vakt(unsigned int td)
{
return std::to_string(int(td / 60) % 12) + ":" + std::to_string(int(td % 60));
// ⚡ Bolt Optimizasyonu: std::to_string ve std::string birleştirme (+) işlemleri
// çok sayıda küçük bellek tahsisine neden olur. Bunun yerine sabit boyutlu
// char dizisi ve std::snprintf kullanarak performansı artırıyoruz.
char buffer[16];
std::snprintf(buffer, sizeof(buffer), "%02d:%02d", int(td / 60) % 12, int(td % 60));
return std::string(buffer);
}

void zaman::vkt_h_v_d()
Expand Down Expand Up @@ -111,16 +116,8 @@ void zaman::vkt_h_v_d()
return nodes;
}();

static const char* cached_nodes[400] = {nullptr};
static bool cached_nodes_init = []() {
for (pugi::xml_node pt = cached_sehir.child("prayertimes"); pt; pt = pt.next_sibling("prayertimes")) {
int day = std::atoi(pt.attribute("dayofyear").value());
if (day >= 0 && day < 400) cached_nodes[day] = pt.text().get();
}
return true;
}();

zaman::xml_bu_gun = (zaman::h_rakam_gun_senenin >= 0 && zaman::h_rakam_gun_senenin < 400 && cached_nodes[zaman::h_rakam_gun_senenin]) ? cached_nodes[zaman::h_rakam_gun_senenin] : "";
zaman::xml_bu_gun = (zaman::h_rakam_gun_senenin >= 0 && zaman::h_rakam_gun_senenin < 400 && cached_nodes[zaman::h_rakam_gun_senenin]) ? std::string(cached_nodes[zaman::h_rakam_gun_senenin].text().get()) : "";

zaman::h_aksam = zaman::xml_bu_gun.substr(50, 6);
zaman::h_istibak_nucum = zaman::xml_bu_gun.substr(56, 6);
Expand All @@ -130,7 +127,7 @@ void zaman::vkt_h_v_d()
//buradaka kodları yeniliyoruz çünkü bir sonraki gün kılacağız verileri:

int next_day = zaman::h_rakam_gun_senenin + 1;
zaman::xml_bu_gun = (next_day >= 0 && next_day < 400 && cached_nodes[next_day]) ? cached_nodes[next_day] : "";
zaman::xml_bu_gun = (next_day >= 0 && next_day < 400 && cached_nodes[next_day]) ? std::string(cached_nodes[next_day].text().get()) : "";

zaman::h_imsak = zaman::xml_bu_gun.substr(0, 4) ;
zaman::h_sabah = zaman::xml_bu_gun.substr(5, 5) ;
Expand Down Expand Up @@ -177,19 +174,19 @@ void zaman::vkt_turk_v_d()
zaman::kible_saati_td = (1440 - zaman::h_aksam_td) + zaman::h_kible_saati_td ;

zaman::aksam = "00:00";
zaman::istibak_nucum.append( td_to_vakt(istibak_nucum_td) );
zaman::yatsi.append( td_to_vakt(yatsi_td) );
zaman::isa_sani.append( td_to_vakt(isa_sani_td) );
zaman::imsak.append( td_to_vakt(imsak_td) );
zaman::sabah.append( td_to_vakt(sabah_td) );
zaman::gunes.append( td_to_vakt(gunes_td) );
zaman::israk.append( td_to_vakt(israk_td) );
zaman::kerahet.append( td_to_vakt(kerahet_td) );
zaman::ogle.append( td_to_vakt(ogle_td) );
zaman::ikindi.append( td_to_vakt(ikindi_td) );
zaman::asr_sani.append( td_to_vakt(asr_sani_td) );
zaman::isfirar_sems.append( td_to_vakt(isfirar_sems_td) );
zaman::kible_saati.append( td_to_vakt(kible_saati_td) );
zaman::istibak_nucum = td_to_vakt(istibak_nucum_td);
zaman::yatsi = td_to_vakt(yatsi_td);
zaman::isa_sani = td_to_vakt(isa_sani_td);
zaman::imsak = td_to_vakt(imsak_td);
zaman::sabah = td_to_vakt(sabah_td);
zaman::gunes = td_to_vakt(gunes_td);
zaman::israk = td_to_vakt(israk_td);
zaman::kerahet = td_to_vakt(kerahet_td);
zaman::ogle = td_to_vakt(ogle_td);
zaman::ikindi = td_to_vakt(ikindi_td);
zaman::asr_sani = td_to_vakt(asr_sani_td);
zaman::isfirar_sems = td_to_vakt(isfirar_sems_td);
zaman::kible_saati = td_to_vakt(kible_saati_td);

};

Expand All @@ -208,7 +205,10 @@ void zaman::sat_turk_v_d()
zaman::dakika = int(( zaman::zaman_td / 60) % 60 ) ;
zaman::saniye = int(( zaman::zaman_td ) % 60) ;

zaman::simdiki_zaman_turk.append(std::to_string(zaman::saat) + ":" + std::to_string(zaman::dakika) + ":" + std::to_string(zaman::saniye));
// ⚡ Bolt Optimizasyonu: std::string ataması için sabit boyutlu buffer
char buffer[32];
std::snprintf(buffer, sizeof(buffer), "%02d:%02d:%02d", zaman::saat, zaman::dakika, zaman::saniye);
zaman::simdiki_zaman_turk = std::string(buffer);

};

Expand Down