Hello Christopher, I tried with 32 MB and even 24 MB heap and the CPU usage and response time remained the almost the same (the difference is negligible) as with 1 GB heap. The cumulative allocated memory for the HeapByteBuffer remains about 400 MB, but of course the frequency of GCs is increased.
Regards, Lazar On Tue, Aug 9, 2016 at 7:27 PM, Christopher Schultz < ch...@christopherschultz.net> wrote: > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA256 > > Lazar, > > On 8/9/16 8:40 AM, Lazar Kirchev wrote: > > Hello! When handling requests which make use of request dispatcher, > > Tomcat 7.0.70 allocates more memory in comparison to 7.0.69. This > > seems to come from the encoding of the path introduced with this > > change http://svn.apache.org/viewvc/tomcat/tc7.0.x/trunk/java/org/ > > apache/catalina/core/ApplicationContext.java?r1=1741024&r2=1741023&pat > hrev= > > > > > 1741024 > > 50000 requests to a very simple servlet which only gets a request > > dispatcher for some path lead to allocation of about 400 MB. > > However, after a GC they are freed and this actually does not > > influence CPU or response time. Has anybody noticed this effect and > > what do you think about it? > > What happens if you set the heap size very low (e.g. 32MiB) and run > the same test? Does the memory usage grow to 400MiB, or does the > request performance start to degrade? > > I'm curious if you are just seeing the effect of the GC doing its job > correctly. > > - -chris > -----BEGIN PGP SIGNATURE----- > Comment: GPGTools - http://gpgtools.org > Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/ > > iQIcBAEBCAAGBQJXqgSPAAoJEBzwKT+lPKRY6+8P/2vzkhQJkPKjYAFln5wkbPp7 > lbIVDvcH5546ch4nTQsrMPiUT/m71wwDytn6qOMzP9dIbAXjC3tBJI+nqDthkZyQ > ScmIi2A93JQl0aOHrMzCuS3cFk0sNdwK3n2sk8ZcFd5/KZ5cwxkyeUqwiRVbU5bA > MjJsEiq+r7Vgo6V3mAxMwaKS7mwLc1hcgJMrhJA8gjfeHzxhzeG0mcrIGrg5cGvl > mTHLovt9x1ts4KNApdt4DUSg+Yt3Fx/Gj1aoL1x1KbPM9VIJSb52IG/03WPMxIkq > fSM71fbZHpjZy19uV+e50sHzM0fg96RsrlQ7m5Uvjgqkz6zxNYlsX3tC0z1E7oEr > wq1Qi0C3dCbRe6vqnN3znYg+DyrlZ/R+qO8+35GD3ljiiDuJLpevYFNVjNceFn1Y > Qno6W8/2Dp1eHTxaAAVY4hhbdZyzLgxD+lOu+THkOnoZwx8Bw8TXStHIdbwtMfSz > 9jGuZU4W/t9uTgW6ZnauS16v2EKUbicFY9L5FB3vrRUi1qm+pYVMUdQoZtVl2yL6 > ZoDTEZTGzvpNUoJLGDzWjp9QkXkVGIrgM7+uYXIDcMUn7QrmLLab7oGJO1pLuAlz > 9BJiLpjqja5eAHp/Bz1ud5ZZhBaNECJIqhkjma/+LAC1Meullf3ct4FRmL8aGfUz > m0ntWlqyXwr6EbmRjbFE > =FTq+ > -----END PGP SIGNATURE----- > > --------------------------------------------------------------------- > To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org > For additional commands, e-mail: users-h...@tomcat.apache.org > >
