Tag Archives: core

Percona 對 mysql_query_cache 的測試 (以 Magento 為例)

Percona 的人以現在的觀點來看 mysql_query_cache:「The MySQL query cache: Worst enemy or best friend?」。 起因主要也是懷疑 query cache 是 global mutex 在現在的硬體架構 (主要是 CPU 數量成長) 應該是個負面的影響,但不確定影響多少: The query cache is well known for its contentions: a global mutex has to be acquired for any … Continue reading

Posted in Computer, Database, Hardware, Murmuring, MySQL, Software | Tagged , , , , , , , , , , , , , , | 3 Comments

支援多 CPU 的 ab:wrk

在「wrk」這邊看到 wrk 這個工具:「Modern HTTP benchmarking tool」。 利用 multi-threading 與 epoll/kqueue 撐出效能: wrk is a modern HTTP benchmarking tool capable of generating significant load when run on a single multi-core CPU. It combines a multithreaded design with scalable event notification systems … Continue reading

Posted in Computer, Murmuring, Network, Software, WWW | Tagged , , , , , , , , , , , , | Leave a comment

Ubuntu Core 與 Snappy Transactional Updates

在 OSNews 上看到「Announcing Ubuntu Core, with snappy transactional updates」,原文出自 Ubuntu 老大 Mark Shuttleworth 的文章「Announcing Ubuntu Core, with snappy transactional updates!」。 依照官方說明: Ubuntu Core is a minimal server image with the same libraries as today’s Ubuntu, but applications are provided through … Continue reading

Posted in Cloud, Computer, Linux, Murmuring, Network, OS, Software | Tagged , , , , , , | Leave a comment

從爆炸的遺跡尋找蛛絲馬跡:在 MySQL crash 後,從 core file 找出當時有哪些 query 在執行

Percona 寫了一篇文章,說明在 MySQL core dump 後,要如何從 core file 撈出當時有哪些 query 在跑:「How to Extract All Running Queries (Including the Last Executed Statement) from a Core File?」。 一年前 Percona 的人也有寫一篇「How to obtain the “LES” (Last Executed Statement) from an Optimized Core Dump?」,今年這篇則是改良版,可以看到操作的方式便簡單了... … Continue reading

Posted in Computer, Database, Murmuring, MySQL, Software | Tagged , , , , , , | Leave a comment

支援新版 Plurk API (OAuth Core 1.0a) 的 Twitter To Plurk Script

code 放在「Plurk 新版 OAuth Core 1.0a 的 twitter to plurk」,其中裡面用到的 SQLite 的表格結構請參考「Twitter 轉 Plurk 的程式...」這篇文章的說明。把本來是 plaintext password 的程式換過去後看起來舒服多了,不過中間寫起來讓人頗 orz... 先是一直沒辦法透過 OAuth::Lite 送出 UTF8 內容,於是決定換成 Net::OAuth,結果因為文件內的範例都沒講到重點而倒地不起... 然後遇到 Plurk API 2.0 beta 的文件沒有列出是 GET 或是 POST,於是又試了老半天... 文件真的很重要...

Posted in Blog, Computer, Murmuring, Network, Programming, Security, Social, Software, WWW | Tagged , , , , , | 2 Comments