What’s new inside jQuery 3.0 - Slimmer and faster
It's been 10 years since jQuery started ruling the web and it has stuck around for good reasons. After a long time jQuery got a major update last month with the release of jQuery 3.0 and jQuery Compat 3.0. This release promises a slimmer and faster jQuery, with backwards compatibility in mind. You can download the latest jQuery 3.0 from the download page. It's also worth having a look at the upgra
Confirmed: OpenJDK JIT compiler emits efficient conditional move machine codes
Confirmed: OpenJDK JIT compiler emits efficient conditional move machine codes On popular programmers’ Q&A site stackoverflow.com the hit question of the last few years dealt with the effect of branching on program performance. I recommend that you read the brilliant explanation there, but if you don’t have much time, here’s the summary. Modern processors execute commands in a pipeline. While One
Why is processing a sorted array faster than processing an unsorted array?
In this C++ code, sorting the data (before the timed region) makes the primary loop ~6x faster: #include <algorithm> #include <ctime> #include <iostream> int main() { // Generate data const unsigned arraySize = 32768; int data[arraySize]; for (unsigned c = 0; c < arraySize; ++c) data[c] = std::rand() % 256; // !!! With this, the next loop runs faster. std::sort(data, data + arraySize); // Test clo
I/O waitが発生する原理(dirtyメモリ、write back) - 脳汁portal
I/O waitにはdirtyメモリとwrite back処理(pdflush)が深く関係しています。 書き込み処理 低負荷時 書き込み処理(見かけ上の書き込み処理) ↓ dirtyフラグと一緒に随時メモリに書き込まれる(dirtyメモリ) ↓ 5秒に一度dirtyメモリを読み取って実際に物理ディスクに書き込む(write back処理＝実際の書き込み処理) ⇒これがI/O 処理の開始である。 中程度負荷時 書き込み処理(見かけ上の書き込み処理) ↓ dirtyフラグと一緒に随時メモリに書き込まれる(dirtyメモリ) ↓ dirtyメモリがある一定サイズに達した時点で、(5秒待たずに)I/O処理を開始して実際に物理ディスクに書き込む(write back処理) 高負荷時/過負荷時 書き込み処理(見かけ上の書き込み処理) ↓ dirtyフラグと一緒に随時メモリに書き込まれる(dirtyメモ
_Details)
Linux Multi-Queue Block IO Queueing Mechanism (blk-mq) Details - Thomas-Krenn-Wiki-en
Blk-mq integrates seamlessly into the Linux storage stack. It provides basic functions to device drivers for mapping I/O enquiries to multiple queues. The tasks are distributed across multiple threads and therefore to multiple CPU cores (per-core software queues). Blk-mq compatible drivers inform blk-mq how many parallel hardware queues a device supports (number of submission queues as part of the
リリース、障害情報などのサービスのお知らせ
最新の人気エントリーの配信
処理を実行中です
j次のブックマーク
k前のブックマーク
lあとで読む
eコメント一覧を開く
oページを開く
Binary Search *eliminates* Branch Mispredictions
