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Hello, The Hotspot JVM Runtime group would like to put forth a project proposal to improve the capabilities of DTrace''s ustack()/jstack() actions to better handle non-standard user stack frames. This email will describe the background, the problem, and our proposed solution. We''re interested in getting a sponsor for this work to help us with the process of getting the code into the solaris codebase, and we''r...

...8 0 232 100 0 0 0 31 0 0 1 27 0 47 26 12 10 0 10 100 0 0 0 So, 100% cpu in usr mode looks a lot like some kind of infinite loop I tried to dig it up using dtrace: profile-1001us /(execname=="java") && (pid==$1)/ { @[jstack()]=count(); } tick-20s { exit(O); } But I got a LOT of these arrors: dtrace: error on enabled probe ID 1 (ID 52070: profile:::Profile-1001us): invalid address (0x96a7e000) in action #2 and th stack traces are mostly the hex addresses without the names: 0xf886ca64...

...ere with the use of kmdb 6295554 dtrace doesn''t report errors in ERROR probes 6311947 add umod()/ufunc()/usym(), mod()/func()/sym() 6311952 buffered handler should be called after printing each tuple element 6311956 drops induced by END are not recorded 6311958 should indicate missing jstack() frames due to string table overflows 6311960 allow some DTrace options to be set dynamically 6311963 jstack() produces stacks packed with "StubRoutines" 6311975 allow boolean DTrace options to be unset 6315028 allow quantize()/lquantize() increments to be D expressions 6315033 add dtrac...

This is a semantic question. (I''m doing some technical writing about DTrace.) I''ll little confused about how to explain what an "action" is. By any definition, "trace(x);" is an action. However, what about just "i++;"? Looking at the DTrace guide page 76: "Probe actions are described by a list of statements separated by semicolons (;)

As of patch 32953 dtrace support is in bleadperl (5.11.0). The probes are based on Alan Burlinson''s original blog post on the subject: http://blogs.sun.com/alanbur/date/20050909 By guarding the probes with PERL_SUB_*_ENABLED the performance hit is unmeasurable. All the necessary bits already existed in the wild. I just assembled them and made the necessary changes to

Hi, I need help in calculating Java method time-stamp in following fashion. Consider following method example. long method3(long stop) { try { Thread.sleep(1500); } catch (Exception e) { } //////////////////// real CPU intensive operation /////////////////////////// for (int i = 1; i < stop; i++) { stop = stop * stop * i; };

Hi all i want to view the stack trace of the real time java application using DTrace probes. i am using jrts provider for finding the information of real time threads. In this i have used the ustack(), jstack() and this gives the following type of information libjvm.so`__1cJJavaCallsMcall_virtual6FpnJJavaValue_nGHandle_nLKlassHandle_nMsymbolHandle_5pnGThread__v_+0x5e libjvm.so`__1cMthread_entry6FpnKJavaThread_pnGThread__v_+0xc8 libjvm.so`__1cKJavaThreadRthread_main_inner6M_v...