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- Onwards and upwards - 3 Updates
| woodbrian77@gmail.com: Nov 29 02:27PM -0800 Currently all messages between my back and middle tiers are compressed. The following shows the messages the middle tier sends to the back tier. middle_messages_back @out (messageid_t, ::std::vector<cmw_account_info>) @out (messageid_t, ::cmw::marshalling_integer, cui_generator) @out (messageid_t) } The first message there is a login request. The second is a code generation request and the last is a keep alive. The keep alive is just a messageid_t which, in this case, is one byte. After being compressed, the keep alive message increases to 12 bytes. I think compression is helpful for the code generation request message, but not for the keep alive message. I'd guess compression isn't helping with the login message either, but am not sure. I've worked on systems that use compression for everything or not at all. Have you ever worked on a system that uses both compressed and non-compressed messages? I'd like to find some info on systems like that. Brian Ebenezer Enterprises - In G-d we trust. http://webEbenezer.net |
| Mr Flibble <flibbleREMOVETHISBIT@i42.co.uk>: Nov 29 10:59PM > everything or not at all. Have you ever worked on a > system that uses both compressed and non-compressed > messages? I'd like to find some info on systems like that. Sausages. /Flibble |
| Ian Collins <ian-news@hotmail.com>: Nov 30 12:10PM +1300 > everything or not at all. Have you ever worked on a > system that uses both compressed and non-compressed > messages? I'd like to find some info on systems like that. Compression is seldom any use for anything other than bulk transfer of compressible data or sausages. For inter-process or intra-process messages the overheads incurred by compression tend to outweigh any benefits for short messages and for LAN/WAN messaging packet latency has much more of a performance impact than packet size. One example is the application I use to distribute filesystems between local and geographically distributed hosts, there I only consider compression for full (not incremental) transfers of filesystems with a worthwhile compress ratio. -- Ian Collins |
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