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use iostream instead of printf #977

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merged 2 commits into from
Jan 15, 2024
Merged

use iostream instead of printf #977

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9d1f9c6
use iostream instead of printf
va-kuznecov Jan 12, 2024
b3ea45d
fixes from PR, add reserve to strings
va-kuznecov Jan 15, 2024
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37 changes: 14 additions & 23 deletions ydb/core/base/logoblob.cpp
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Original file line number Diff line number Diff line change
@@ -1,35 +1,26 @@
#include "logoblob.h"
#include <ydb/core/protos/base.pb.h>
#include <util/string/printf.h>

namespace NKikimr {

TString TLogoBlobID::ToString() const {
return Sprintf(
"[%" PRIu64 ":%" PRIu32 ":%" PRIu32 ":%" PRIu32 ":%" PRIu32 ":%" PRIu32 ":%" PRIu32 "]",
TabletID(),
Generation(),
Step(),
Channel(),
Cookie(),
BlobSize(),
PartId()).data();
TString str;
str.reserve(64);
TStringOutput outStr(str);
Out(outStr);
return str;
}

void TLogoBlobID::Out(IOutputStream &o) const {
char buf[240];
snprintf(buf, sizeof(buf),
"[%" PRIu64 ":%" PRIu32 ":%" PRIu32 ":%" PRIu32 ":%" PRIu32 ":%" PRIu32 ":%" PRIu32 "]",
TabletID(),
Generation(),
Step(),
Channel(),
Cookie(),
BlobSize(),
PartId()
);

o << buf;
o << '['
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15 виртуальных вызовов нам для этого нужно :)

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ну как мы любим, пусть разработчики компиляторов и процессоров делают свою работу и оптимизируют виртуальные вызовы

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побенчили с Сашей, получилось, что новая версия строго быстрее

ToString(Sprintf): 5.345924s
Out(snprintf): 5.017919s
ToString(stream): 3.712372s
Out(stream): 3.966677s

<< TabletID() << ':'
<< Generation() << ':'
<< Step() << ':'
<< Channel() << ':'
<< Cookie() << ':'
<< BlobSize() << ':'
<< PartId()
<< ']' ;
}

void TLogoBlobID::Out(IOutputStream &o, const TVector<TLogoBlobID> &vec) {
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13 changes: 6 additions & 7 deletions ydb/core/base/traceid.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -20,16 +20,15 @@ TTraceID TTraceID::GenerateNew() {
}

TString TTraceID::ToString() const {
TString result;
TStringOutput out(result);
Out(out);
return result;
TString str;
str.reserve(128);
TStringOutput outStr(str);
Out(outStr);
return str;
}

void TTraceID::Out(IOutputStream &o) const {
char buf[240];
snprintf(buf, sizeof(buf), "[ID:%" PRIu64 ", Created: %s]", RandomID, TInstant::MicroSeconds(CreationTime).ToRfc822StringLocal().data());
o << buf;
o << "[ID: " << RandomID << ", " << "Created: " << TInstant::MicroSeconds(CreationTime).ToRfc822StringLocal() << "]";
}

bool TTraceID::operator<(const TTraceID &x) const {
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