{"id":41458,"date":"2003-08-15T16:00:00","date_gmt":"2003-08-15T08:00:00","guid":{"rendered":"http:\/\/itteacheritfreelance.hk\/test\/wordpress\/?guid=dcb384fe2adadeef6b00f1cc95e21f4f"},"modified":"2003-08-15T16:00:00","modified_gmt":"2003-08-15T08:00:00","slug":"java-tip-141-fast-math-with-jni","status":"publish","type":"post","link":"https:\/\/itteacheritfreelance.hk\/test\/wordpress\/2003\/08\/15\/java-tip-141-fast-math-with-jni\/","title":{"rendered":"Java Tip 141: Fast math with JNI"},"content":{"rendered":"<article>\n<section class=\"page\">\n<p>While developing a computer-generated hologram (CGH) program, I noticed that the math routines in Java 2 Platform, Standard Edition (J2SE) 1.4x were several times slower than the corresponding routines in J2SE 1.3.1. Sun Microsystems has implemented a new math package, <code>StrictMath<\/code>, in J2SE 1.4 that guarantees identical math calculations across all platforms at the expense of execution speed. My CGH program ran seven times slower with the new J2SE 1.4x routines! I didn&#8217;t want to switch back to J2SE 1.3.1, however, because I wanted to use the new <code>javax.imageio<\/code> package to save my holograms to disk as <code>.png<\/code> files. I submitted some bug reports to Sun about this serious performance regression, but received no meaningful response.<\/p>\n<p class=\"jumpTag\"><a href=\"https:\/\/www.javaworld.com\/article\/2077508\/build-ci-sdlc\/java-tip-141--fast-math-with-jni.html#jump\">To read this article in full, please click here<\/a><\/p>\n<\/section>\n<\/article>\n","protected":false},"excerpt":{"rendered":"<p>While developing a computer-generated hologram (CGH) program, I noticed that the math routines in Java 2 Platform, Standard Edition (J2SE) 1.4x were several times slower than the corresponding routines in J2SE 1.3.1. Sun Microsystems has implemented a &#8230; <a href=\"https:\/\/itteacheritfreelance.hk\/test\/wordpress\/2003\/08\/15\/java-tip-141-fast-math-with-jni\/\">\u95b1\u8b80\u5168\u6587 <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":127,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"slim_seo":[],"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":false,"jetpack_social_options":{"image_generator_settings":{"template":"highway","enabled":false}}},"categories":[2,6,7],"tags":[437,531,535,417,418,419,420,421,422,423,424,425,426,427,428,429,430,431,432,433,434,435,436,438,569,570,571,572,573,574,575,576,577,578,579,580,581,582,583,584,398,402,397,414,413,410,409,407,408,406,399,400,394,375,558,556,557,560,559,555,561,566,553,554,565,563,564,562,183,567,568,10,401,396,403,412,411,395,405,404],"jetpack_publicize_connections":[],"aioseo_notices":[],"jetpack_featured_media_url":"","jetpack_shortlink":"https:\/\/wp.me\/p7prtj-aMG","jetpack-related-posts":[],"jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/itteacheritfreelance.hk\/test\/wordpress\/wp-json\/wp\/v2\/posts\/41458"}],"collection":[{"href":"https:\/\/itteacheritfreelance.hk\/test\/wordpress\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/itteacheritfreelance.hk\/test\/wordpress\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/itteacheritfreelance.hk\/test\/wordpress\/wp-json\/wp\/v2\/users\/127"}],"replies":[{"embeddable":true,"href":"https:\/\/itteacheritfreelance.hk\/test\/wordpress\/wp-json\/wp\/v2\/comments?post=41458"}],"version-history":[{"count":1,"href":"https:\/\/itteacheritfreelance.hk\/test\/wordpress\/wp-json\/wp\/v2\/posts\/41458\/revisions"}],"predecessor-version":[{"id":41459,"href":"https:\/\/itteacheritfreelance.hk\/test\/wordpress\/wp-json\/wp\/v2\/posts\/41458\/revisions\/41459"}],"wp:attachment":[{"href":"https:\/\/itteacheritfreelance.hk\/test\/wordpress\/wp-json\/wp\/v2\/media?parent=41458"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/itteacheritfreelance.hk\/test\/wordpress\/wp-json\/wp\/v2\/categories?post=41458"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/itteacheritfreelance.hk\/test\/wordpress\/wp-json\/wp\/v2\/tags?post=41458"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}