-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 Daniel,
On 1/21/15 3:16 PM, Daniel Mikusa wrote: > On Wed, Jan 21, 2015 at 2:59 PM, Mike Seda > <mike.s...@lillegroup.com> wrote: > >> Is it advisable to have the following JVM option set in Tomcat 7 >> (with Java 7)? -XX:+DisableExplicitGC >> > > It may or may not make a difference. Some questions like these > come to mind... > > - How would you feel if one of the applications you deployed > called System.gc()? - How about if it called it a lot? or at a > really inconvenient time? - How much do you trust your apps or > their developers? - Does one of your apps rely on that > functionality for some reason? Our application does not call System.gc automatically, but we have that ability through an admin screen where we can say "do GC now", and we call it. Sometimes when we have a heap that's been high for a while - -- say, tripping our monitoring software a lot -- we go in there and hit the GC button to see what happens. Usually, heap usage goes down to 25% of what it had been before... it's just that the JVM hadn't done a full GC in a while because it didn't need to. >> Or will this prevent Tomcat itself from calling System.gc() when >> it needs to? > > I really doubt Tomcat would call that. Tomcat calls System.gc() in only one place -- StandardHost.findReloadedContextMemoryLeaks -- which is mostly a debugging tool. - -chris -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 Comment: GPGTools - http://gpgtools.org iQIcBAEBCAAGBQJUwBFtAAoJEBzwKT+lPKRYiVMP/RAaAjPpKJWio+0I2Zrwnvu1 xryvw4Ua7DiVzh9ZVFy2NWvw92ReSUWxw6Uf2sKUVOwuC0X5HhnKh7VKtS1fy3h0 6zt/o3StQfugEx/lPA7L1uREJOedM1GOHcKeHNKhC3JQUVH2VKELraO+TMYkCiDU iiMr7pxoPC/TvCYFKQNgVom5TSEcYi18RL//UU/gBZPk+2ZHV8DbyW0wbLG65Lu2 FDEZw01tEqrRpIZrRndECL+9NbGEv6vLte1bPEk+2pImcaIKYME+z20ztsa8KfA1 kbQO6yLvhW4tREH/3SZqfacway4qOxjKQFWqDmkosm7HJXXKlEqsDT+Mi19mTD26 QvD8aQ6tCp5m6SPG89MN5dk6zHtnjVXrjaVMVx75e0IwSN35aJcUm3g5fTdXLwR6 vB4U3T958jt5/uD/k9QxJVB15R8+YdU29iBdxKKQ2C86eGa6jUdizaexNPPnaGPi R9xrSpHo9JjR/5uC1fIcSgwC6JfVH+j8y5j5Yx87vDllD70IkIgh6wtqxdBmL5as 7poC/h8D3TmZwKVtXoAf+DaFIZye9tqxyD8x56XLjVLfBSt9eta0ppunPtqY61KT feHBshR7IXvkP29h2rHnP0Yo5abFgQgz8+jFJSmhKpX9CuKtscToCE9Wbgf5ejST HZSKRwOUMcCVomv4hTwq =WE8p -----END PGP SIGNATURE----- --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
