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why there's two threads in node when it's idle? #5775
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Node.js (or rather libuv) maintains a small pool of worker threads. Threads are fairly expensive to spin up and tear down, that's why they stay around. In the future, please direct questions to the mailing list. The issue tracker is for feature requests and reporting bugs. |
gibfahn
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Apr 26, 2016
The following significant (semver-major) changes have been made since the previous Node v5.0.0 release. * Buffer * New Buffer constructors have been added [nodejs#4682](nodejs/node#4682) * Previously deprecated Buffer APIs are removed [nodejs#5048](nodejs/node#5048), [nodejs#4594](nodejs/node#4594) * Improved error handling [nodejs#4514](nodejs/node#4514) * Cluster * Worker emitted as first argument in 'message' event [nodejs#5361](nodejs/node#5361). * Crypto * Improved error handling [nodejs#3100](nodejs/node#3100), [nodejs#5611](nodejs/node#5611) * Simplified Certificate class bindings [nodejs#5382](nodejs/node#5382) * Improved control over FIPS mode [nodejs#5181](nodejs/node#5181) * pbkdf2 digest overloading is deprecated [nodejs#4047](nodejs/node#4047) * Dependencies * Reintroduce shared c-ares build support [nodejs#5775](nodejs/node#5775). * V8 updated to 5.0.71.31 [nodejs#6111](nodejs/node#6111). * DNS * Add resolvePtr API to query plain DNS PTR records [nodejs#4921](nodejs/node#4921). * Domains * Clear stack when no error handler [nodejs#4659](nodejs/node#4659). * File System * The `fs.realpath()` and `fs.realpathSync()` methods have been updated to use a more efficient libuv implementation. This change includes the removal of the `cache` argument and the method can throw new errors [nodejs#3594](nodejs/node#3594) * FS apis can now accept and return paths as Buffers [nodejs#5616](nodejs/node#5616). * Error handling and type checking improvements [nodejs#5616](nodejs/node#5616), [nodejs#5590](nodejs/node#5590), [nodejs#4518](nodejs/node#4518), [nodejs#3917](nodejs/node#3917). * fs.read's string interface is deprecated [nodejs#4525](nodejs/node#4525) * HTTP * 'clientError' can now be used to return custom errors from an HTTP server [nodejs#4557](nodejs/node#4557). * Modules * Current directory is now prioritized for local lookups [nodejs#5689](nodejs/node#5689) * Symbolic links are preserved when requiring modules [nodejs#5950](nodejs/node#5950) * Net * DNS hints no longer implicitly set [nodejs#6021](nodejs/node#6021). * Improved error handling and type checking [nodejs#5981](nodejs/node#5981), [nodejs#5733](nodejs/node#5733), [nodejs#2904](nodejs/node#2904) * Path * Improved type checking [nodejs#5348](nodejs/node#5348). * Process * Introduce process warnings API [nodejs#4782](nodejs/node#4782). * Throw exception when non-function passed to nextTick [nodejs#3860](nodejs/node#3860). * Readline * Emit key info unconditionally [nodejs#6024](nodejs/node#6024) * REPL * Assignment to `_` will emit a warning. [nodejs#5535](nodejs/node#5535) * Timers * Fail early when callback is not a function [nodejs#4362](nodejs/node#4362) * TLS * Rename 'clientError' to 'tlsClientError' [nodejs#4557](nodejs/node#4557) * SHA1 used for sessionIdContext [nodejs#3866](nodejs/node#3866) * TTY * Previously deprecated setRawMode wrapper is removed [nodejs#2528](nodejs/node#2528). * Util * Changes to Error object formatting [nodejs#4582](nodejs/node#4582). * Windows * Windows XP and Vista are no longer supported [nodejs#5167](nodejs/node#5167), [nodejs#5167](nodejs/node#5167).
gibfahn
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Apr 27, 2016
The following significant (semver-major) changes have been made since the previous Node v5.0.0 release. * Buffer * New Buffer constructors have been added [nodejs#4682](nodejs/node#4682) * Previously deprecated Buffer APIs are removed [nodejs#5048](nodejs/node#5048), [nodejs#4594](nodejs/node#4594) * Improved error handling [nodejs#4514](nodejs/node#4514) * Cluster * Worker emitted as first argument in 'message' event [nodejs#5361](nodejs/node#5361). * Crypto * Improved error handling [nodejs#3100](nodejs/node#3100), [nodejs#5611](nodejs/node#5611) * Simplified Certificate class bindings [nodejs#5382](nodejs/node#5382) * Improved control over FIPS mode [nodejs#5181](nodejs/node#5181) * pbkdf2 digest overloading is deprecated [nodejs#4047](nodejs/node#4047) * Dependencies * Reintroduce shared c-ares build support [nodejs#5775](nodejs/node#5775). * V8 updated to 5.0.71.31 [nodejs#6111](nodejs/node#6111). * DNS * Add resolvePtr API to query plain DNS PTR records [nodejs#4921](nodejs/node#4921). * Domains * Clear stack when no error handler [nodejs#4659](nodejs/node#4659). * File System * The `fs.realpath()` and `fs.realpathSync()` methods have been updated to use a more efficient libuv implementation. This change includes the removal of the `cache` argument and the method can throw new errors [nodejs#3594](nodejs/node#3594) * FS apis can now accept and return paths as Buffers [nodejs#5616](nodejs/node#5616). * Error handling and type checking improvements [nodejs#5616](nodejs/node#5616), [nodejs#5590](nodejs/node#5590), [nodejs#4518](nodejs/node#4518), [nodejs#3917](nodejs/node#3917). * fs.read's string interface is deprecated [nodejs#4525](nodejs/node#4525) * HTTP * 'clientError' can now be used to return custom errors from an HTTP server [nodejs#4557](nodejs/node#4557). * Modules * Current directory is now prioritized for local lookups [nodejs#5689](nodejs/node#5689) * Symbolic links are preserved when requiring modules [nodejs#5950](nodejs/node#5950) * Net * DNS hints no longer implicitly set [nodejs#6021](nodejs/node#6021). * Improved error handling and type checking [nodejs#5981](nodejs/node#5981), [nodejs#5733](nodejs/node#5733), [nodejs#2904](nodejs/node#2904) * OS X * MACOSX_DEPLOYMENT_TARGET has been bumped up to 10.7 [nodejs#6402](nodejs/node#6402). * Path * Improved type checking [nodejs#5348](nodejs/node#5348). * Process * Introduce process warnings API [nodejs#4782](nodejs/node#4782). * Throw exception when non-function passed to nextTick [nodejs#3860](nodejs/node#3860). * Readline * Emit key info unconditionally [nodejs#6024](nodejs/node#6024) * REPL * Assignment to `_` will emit a warning. [nodejs#5535](nodejs/node#5535) * Timers * Fail early when callback is not a function [nodejs#4362](nodejs/node#4362) * TLS * Rename 'clientError' to 'tlsClientError' [nodejs#4557](nodejs/node#4557) * SHA1 used for sessionIdContext [nodejs#3866](nodejs/node#3866) * TTY * Previously deprecated setRawMode wrapper is removed [nodejs#2528](nodejs/node#2528). * Util * Changes to Error object formatting [nodejs#4582](nodejs/node#4582). * Windows * Windows XP and Vista are no longer supported [nodejs#5167](nodejs/node#5167), [nodejs#5167](nodejs/node#5167).
gibfahn
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May 6, 2016
The following significant (semver-major) changes have been made since the previous Node v5.0.0 release. * Buffer * New Buffer constructors have been added [nodejs#4682](nodejs/node#4682) * Previously deprecated Buffer APIs are removed [nodejs#5048](nodejs/node#5048), [nodejs#4594](nodejs/node#4594) * Improved error handling [nodejs#4514](nodejs/node#4514) * Cluster * Worker emitted as first argument in 'message' event [nodejs#5361](nodejs/node#5361). * Crypto * Improved error handling [nodejs#3100](nodejs/node#3100), [nodejs#5611](nodejs/node#5611) * Simplified Certificate class bindings [nodejs#5382](nodejs/node#5382) * Improved control over FIPS mode [nodejs#5181](nodejs/node#5181) * pbkdf2 digest overloading is deprecated [nodejs#4047](nodejs/node#4047) * Dependencies * Reintroduce shared c-ares build support [nodejs#5775](nodejs/node#5775). * V8 updated to 5.0.71.31 [nodejs#6111](nodejs/node#6111). * DNS * Add resolvePtr API to query plain DNS PTR records [nodejs#4921](nodejs/node#4921). * Domains * Clear stack when no error handler [nodejs#4659](nodejs/node#4659). * File System * The `fs.realpath()` and `fs.realpathSync()` methods have been updated to use a more efficient libuv implementation. This change includes the removal of the `cache` argument and the method can throw new errors [nodejs#3594](nodejs/node#3594) * FS apis can now accept and return paths as Buffers [nodejs#5616](nodejs/node#5616). * Error handling and type checking improvements [nodejs#5616](nodejs/node#5616), [nodejs#5590](nodejs/node#5590), [nodejs#4518](nodejs/node#4518), [nodejs#3917](nodejs/node#3917). * fs.read's string interface is deprecated [nodejs#4525](nodejs/node#4525) * HTTP * 'clientError' can now be used to return custom errors from an HTTP server [nodejs#4557](nodejs/node#4557). * Modules * Current directory is now prioritized for local lookups [nodejs#5689](nodejs/node#5689) * Symbolic links are preserved when requiring modules [nodejs#5950](nodejs/node#5950) * Net * DNS hints no longer implicitly set [nodejs#6021](nodejs/node#6021). * Improved error handling and type checking [nodejs#5981](nodejs/node#5981), [nodejs#5733](nodejs/node#5733), [nodejs#2904](nodejs/node#2904) * OS X * MACOSX_DEPLOYMENT_TARGET has been bumped up to 10.7 [nodejs#6402](nodejs/node#6402). * Path * Improved type checking [nodejs#5348](nodejs/node#5348). * Process * Introduce process warnings API [nodejs#4782](nodejs/node#4782). * Throw exception when non-function passed to nextTick [nodejs#3860](nodejs/node#3860). * Readline * Emit key info unconditionally [nodejs#6024](nodejs/node#6024) * REPL * Assignment to `_` will emit a warning. [nodejs#5535](nodejs/node#5535) * Timers * Fail early when callback is not a function [nodejs#4362](nodejs/node#4362) * TLS * Rename 'clientError' to 'tlsClientError' [nodejs#4557](nodejs/node#4557) * SHA1 used for sessionIdContext [nodejs#3866](nodejs/node#3866) * TTY * Previously deprecated setRawMode wrapper is removed [nodejs#2528](nodejs/node#2528). * Util * Changes to Error object formatting [nodejs#4582](nodejs/node#4582). * Windows * Windows XP and Vista are no longer supported [nodejs#5167](nodejs/node#5167), [nodejs#5167](nodejs/node#5167).
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I use pstree to show threads for node
my node version is v0.11.3
I tried this code in v0.6.3,And there's only one thread. so what's the differece between this two versions?
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