開源HTTP加速器 Varnish Cache 3.0.1 正式版發布
Varnish是一款高性能的開源HTTP加速器，挪威最大的在線報紙 Verdens Gang (http://www.vg.no) 使用3臺Varnish代替了原來的12臺squid，性能居然比以前更好。
Varnish 的作者Poul-Henning Kamp是FreeBSD的內核開發者之一，他認為現在的計算機比起1975年已經復雜許多。在1975年時，儲存媒介只有兩種：內存與硬盤。但現在計算 機系統的內存除了主存外，還包括了cpu內的L1、L2，甚至有L3快取。硬盤上也有自己的快取裝置，因此squid cache自行處理物件替換的架構不可能得知這些情況而做到最佳化，但操作系統可以得知這些情況，所以這部份的工作應該交給操作系統處理，這就是 Varnish cache設計架構。
項目地址：
https://www.varnish-cache.org/
Varnish 3.0.1 正式版發布了，與 3.0 版本比較，改進包括：
- Objects with grace and keep set were mistakenly seen as candidates for the shortlived storage, but would not be cleaned up quickly, something that manifested as if there was a memory leak. This is now fixed.
- When multiple clients were waiting for an object, all clients would be woken up when an object became available, leading to stuck threads. This has now been fixed
- A bug in how XML entities were handled with ESI has been fixed
- The documentation has seen numerous updates
- varnishncsa is now more stable and has support for showing arbitrary request and response fields
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