-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Hi Noah,
On 03/15/2011 06:25 AM, Noah Cutler wrote: > can find nothing on the net re: this apparently basic question. > > Given a simple hello world "app", what is the @memory footprint per > instance in Tomcat 7? > > Just trying to assess options visa vi single instance + multiple virtual > hosts vs. multiple instance single host (preferred option as each client > app is isolated from the other). There is a simple answer from the Java Heap point of view, a stock Apache Tomcat 7.0.11 (running in Oracle JVM 1.6.0_24) around 3.5MB in Heap, 11MB in Permanent Generation after startup (see garbage collection log): Heap after GC invocations=5 (full 2): PSYoungGen total 18752K, used 0K [0x9ea50000, 0x9ff30000, 0xb38f0000) eden space 16128K, 0% used [0x9ea50000,0x9ea50000,0x9fa10000) from space 2624K, 0% used [0x9fa10000,0x9fa10000,0x9fca0000) to space 2624K, 0% used [0x9fca0000,0x9fca0000,0x9ff30000) PSOldGen total 42880K, used 3417K [0x74cf0000, 0x776d0000, 0x9ea50000) object space 42880K, 7% used [0x74cf0000,0x75046520,0x776d0000) PSPermGen total 18176K, used 10916K [0x70cf0000, 0x71eb0000, 0x74cf0000) object space 18176K, 60% used [0x70cf0000,0x71799068,0x71eb0000) - From the system (32bit Linux in my test case) point of view, my test with pmap gave me a total of 1191428K (~ 1.1GB). This includes shared libraries, Heap, Perm, code cache and other native memory (stacks, buffers etc), thus some of this can be used by other JVM instances... To cut it short: Tomcats memory footprint is very small, that shouldn't be a problem for you. The JVM memory footprint depends on JVM version, operating system and might be a problem if you run many JVM instances. Test it in your system... Regards, - -- Thomas Freitag -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.10 (GNU/Linux) iEYEARECAAYFAk1/CqkACgkQGE5pHr3PKuWldQCfag8Uy0K445QX6uMhyJLjRtzL Et8AnjSva8LzilB3gp7Zobc1TdRr0J/S =/Zul -----END PGP SIGNATURE----- --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
