Problem with long pauses in Tenured collection

We have a Swing application running on Windows XP, which gets long pauses when Tenured objects are collected after a running couple of days.
System:
Windows XP
Intel Pentium M 1.8 ghz
512 MB ram
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_10-b03)
JVM Arguments:
-XX:+ForceTimeHighResolution -Xloggc:gc.log -verbose:gc -XX:+PrintGCTimeStamps -XX:+PrintGCDetails -Xms16m -Xmx384m
The first Tenured collections after 1 hour:
3520.317: [GC 3520.317: [DefNew: 2414K->242K(2432K), 0.0035340 secs]3520.320: [Tenured: 32111K->15691K(32140K), 0.3034778 secs] 34405K->15691K(34572K), 0.3072704 secs]
3673.867: [GC 3673.868: [DefNew: 2335K->125K(2432K), 0.0028552 secs]3673.870: [Tenured: 32042K->18786K(32140K), 0.2668128 secs] 34312K->18786K(34572K), 0.2699225 secs]
3839.103: [GC 3839.103: [DefNew: 2423K->156K(2432K), 0.0028918 secs]3839.106: [Tenured: 32126K->22544K(32140K), 0.3026440 secs] 34341K->22544K(34572K), 0.3058143 secs]Pretty harmless so far.
After 1 day:
85332.923: [GC 85332.924: [DefNew: 6528K->703K(6528K), 0.0122671 secs]85332.936: [Tenured: 86929K->48880K(87032K), 0.6243351 secs] 92687K->48880K(93560K), 0.6369188 secs]
97305.405: [GC 97305.405: [DefNew: 6493K->91K(6528K), 0.0041855 secs]97305.410: [Tenured: 86755K->55828K(86776K), 0.5189188 secs] 92662K->55828K(93304K), 0.5233905 secs]
97844.653: [GC 97844.653: [DefNew: 7040K->768K(7040K), 0.0142342 secs]97844.668: [Tenured: 93393K->57002K(93432K), 0.5293686 secs] 99611K->57002K(100472K), 0.5438841 secs]The time between two Tenured collection just took a jump now to about 3 hours. The gc length is about half a second.
After 3 days:
256894.994: [GC 256894.994: [DefNew: 13938K->1166K(14720K), 0.0080440 secs]256895.002: [Tenured: 195455K->114421K(195696K), 0.8638032 secs] 208915K->114421K(210416K), 0.8721174 secs]
258670.232: [GC 258670.232: [DefNew: 14327K->1600K(14720K), 0.0273586 secs]258670.259: [Tenured: 196045K->117861K(196104K), 0.9146393 secs] 209062K->117861K(210824K), 0.9422603 secs]
261577.464: [GC 261577.464: [DefNew: 14144K->584K(14848K), 0.0078192 secs]261577.472: [Tenured: 196705K->121486K(196820K), 0.8976985 secs] 210412K->121486K(211668K), 0.9058215 secs]The Tenured collection interval is about 2-3 hours now. Each collection is about 1 second.
Then we get some peaks after 4 days:
413096.848: [GC 413096.848: [DefNew: 20126K->997K(21504K), 0.0067539 secs]413096.855: [Tenured: 285819K->160167K(285828K), 2.9034254 secs] 305888K->160167K(307332K), 2.9103817 secs]
472214.414: [GC 472214.414: [DefNew: 22388K->1227K(23616K), 0.0095498 secs]472214.424: [Tenured: 313891K->178781K(313992K), 22.2893423 secs] 336110K->178781K(337608K), 22.3386254 secs]
485465.045: [GC 485465.045: [DefNew: 23616K->2423K(23616K), 0.0404118 secs]485465.086: [Tenured: 315925K->203606K(316040K), 9.0069023 secs] 336994K->203606K(339656K), 9.0477205 secs]
492248.783: [GC 492248.783: [DefNew: 24461K->24461K(25536K), 0.0000111 secs]492248.783: [Tenured: 338665K->201218K(339344K), 6.5526445 secs] 363126K->201218K(364880K), 6.5985010 secs]
533898.023: [GC 533898.023: [DefNew: 25913K->25913K(27200K), 0.0000150 secs]533898.024: [Tenured: 337387K->205940K(363008K), 3.2169493 secs] 363301K->205940K(390208K), 3.2172333 secs]
546566.675: [GC 546566.675: [DefNew: 27199K->27199K(27200K), 0.0000103 secs]546566.675: [Tenured: 338319K->227086K(363008K), 26.2682151 secs] 365519K->227086K(390208K), 26.2684060 secs]
562738.779: [GC 562738.780: [DefNew: 26081K->26081K(27200K), 0.0000104 secs]562738.780: [Tenured: 336929K->230971K(363008K), 7.9569240 secs] 363010K->230971K(390208K), 7.9571524 secs]The average time between each young collection is approx. 20 seconds.
7 full gc's have been performed:
3.877: [Full GC 3.877: [Tenured: 1759K->1831K(15168K), 0.0801147 secs] 2351K->1831K(16320K), [Perm : 12287K->12287K(12288K)], 0.0802154 secs]
6.281: [Full GC 6.281: [Tenured: 5071K->4056K(15168K), 0.1245083 secs] 6018K->4056K(16320K), [Perm : 16383K->16383K(16384K)], 0.1245978 secs]
184.854: [Full GC 184.854: [Tenured: 12628K->10437K(15168K), 0.2133769 secs] 12995K->10437K(16320K), [Perm : 20480K->20480K(20480K)], 0.2135845 secs]
5216.782: [Full GC 5216.782: [DefNew: 3008K->101K(3008K), 0.0044835 secs] 35049K->32886K(42340K), 0.0046464 secs]
198022.892: [Full GC 198022.892: [DefNew: 11520K->790K(11520K), 0.0110744 secs] 117670K->108219K(164672K), 0.0112750 secs]
254208.982: [Full GC 254208.982: [DefNew: 13765K->844K(14720K), 0.0059109 secs] 151946K->139025K(210056K), 0.0061115 secs]
566774.751: [Full GC 566774.751: [DefNew: 25680K->1611K(27200K), 0.0103055 secs] 274385K->250385K(390208K), 0.0105140 secs]The long pauses are not acceptable at all. Only pauses under 1 second are tolerable.
I know there is at least one memory leak in the logged software, where probably 50.000-100.000 ThreadGroups are produced each day and not collected (but only with some configurations).
So, after browsing around, I have found out that UseConcMarkSweepGC could reduce the long pauses. I tried it together with CMSIncrementalMode, but the JVM running at one of our customers crashed after 2 hours while using both options together. Apparently there where some issues with the incremental collector, which was fixed in 1.6. I was forced to remove the VM arguments immediately, but will probably use UseConcMarkSweepGC later after some thorough testing.
I have tried find out which other VM options I could use to tune the application, but I'm quite new to this and the amount of options are a bit overwhelming at the moment. I thought I could ask here if someone know some obvious option values (like NewRatio,SurvivorRatio etc.)

>
>
Doesn't a "Full Collection" always collect all generations (i.e. also the perm generation)? It's always been my understanding, that a "Full Collection" is some kind of "irregular" collection which only occurs if the JVM has "really bad need" for memory (e.g. when the concurrent phase of a CMS collection fails, when perm runs full or if someone calls System.gc()). So, as you write earlier, the first 3 collections labeld "Full GC" are real full GCs since they collect all generations (including perm). The latter four collections shouldn't be labeld "Full GC" (as you write). Yes, a full collection collects all the generations including the
perm generation.
In a stop-the-world collector such as the one you're using, a full
collection is not an unusual collection. They just happen less
frequenctly. Objects that survive a minor collection (collection
of the young gen) a few times will be promoted (copied to) the
tenured generation. The idea is that such objects may be
long lived so should be promoted to save the cost of handling
them during a minor collection. Eventually the tenured
generation gets full and then it gets collected.
And yes and yes. The first 3 are full collections and the
latter 4 are labelled incorrectly as full collections.
>
However, there are a lot of collections with "DefNew" followed by "Tenured" (the first three sections in the original post) which are regular collections where the promotion of objects from new to old caused the old generation to run full which triggers a "Tenured collection". But these collections (according to my understanding) are not full collections, but only regular tenured collections. (Sorry, I don't want to be picky about this. I guess that's even what you meant in your post...)I can see how this can be unclear. A "Tenured" collection
is a full collection. It also collects the perm gen. And
in fact it also collects the young gen again. This is how it
is implemented in the hotspot JVM. It can be implemented
differently in other JVM's.
The situation where a "DefNew" is followed by a "Tenured"
as in your logs is a bit unusual I think. The minor collection
is reducing the amount of used space in young generation.
DefNew: 13938K->1166K(14720K)
The decrease from 13938K to 1166K. There is then a collection
of the tenured gen.
Tenured: 195455K->114421K(195696K)
I've seen this when large objects (a significant fraction of
the young gen) are being allocated. The allocation fails in
the young gen, a minor collection is done but the space freed
in the young gen is still not large enough to allocate the object
so a collection of the tenured generation is done and the large
object is allocated directly out of the tenured gen. In the numbers
above after the minor collection about 13M of free space is
available in the young gen. Are you allocating objects larger
that 13M?

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                    u.setCompany(companyDAO.getById((Long) m.get("cOid")));Any help will be appreciated.
Edited by: kminev on Mar 3, 2010 12:25 PM

//This is my entity class
public class User implements Comparable<User> {
    private Long objectId = 0L;
    private Company company;
    private String logon = "";
    private String password = "";
    private String name = "";
    private boolean hasAdminRights=false;
    private boolean hasMaintenanceRights=false;
//This is my bean class
<bean id="userDAO" class=" com.myorg.myapp.dao.jdbc.UserImpl">
        <property name="transactionManager">
            <ref local="transactionManager"/>
        </property>
        <property name="companyDAO">
            <ref local="companyDAO"/>
        </property>
        <property name="companyAccessDAO">
            <ref local="companyAccessDAO"/>
        </property>
    </bean>

Problem with long report - please help

We are using crystal report with ASP.NET/C# (Visual Studio 2005).
Using Crystal report viewer control on the web page to have previews.
A particular report is for say 6000 pages. I can not preview the report on the web page.
I have the following questions:
1. Does it make sense to think of previewing such a huge report on web page?
2. What should be the alternate?
3. I tried "Export to PDF" technique, but it failed.
Thanks in advance for your help.
Regards,
Kangkan

I tried to use exportToPDF technique. It works when the number of page is less. But just hangs up when the number of pages is high. I am working on finding the breaking number.
There is no problem with HD space as well.
I also tried to print the report to a printer on the server directly. I used the printer as "Adobe PDF" to use Acrobat Distiller to create the PDF. It starts up and asks for the destination for the PDF file also. Once it starts the system shown an error and the Microsoft Feedback Assistant for failed application comes up.
I am now trying to print the pages to a network printer connected to the server. Shall get back with latest update after sometime.
Please do look into other possibilities or points where I might have committed an mistake.
Thanks and regards,
Kangkan

Olympus E-500 raw file problem with long exposures

Hi,
This topic has come up before, but wasn't resolved. Maybe its somewhere else, but I can't find it.
http://discussions.apple.com/thread.jspa?messageID=4994383&#4994383
Raw files from my Olympus E-500 with exposures over 3.2s come up with overexposed looking previews in Aperture. I think there is some automatic noise reduction (dark frame) info in these files, since they are 16.68Mb instead of the normal 13.47Mb. Apparently Aperture doesn't know what to do with these larger files.
Is there a known way around this within Aperture? The files open fine within Olympus Master 2 and Raw Photo Processor.
I've pasted a screen shot here with some links to raw files:
http://www.mso.anu.edu.au/~grant/wp/2007/10/raw-problems-with-aperture/
cheers
Grant

Yea, I've had that issue also and figured out the DNG workaround. Filed a bugreport with Apple on Nov 2nd, 2006. It sat with what looked like no attention right up until I got an e-mail on Oct 26th, 2007 (notice the date) saying that the issue was fixed in 10.5. I had already preordered Leopard so was hoping this was right. It wasn't. It's still borked. Logged notes back into the issue saying it wasn't.
Perhaps if more E-500 users report this it'll get more attention.
http://bugreport.apple.com

Full GCs with long pauses

Long delays are being encountered when Full GCs kick in. Here are the statistics relating
to the a sample Full GC, with heap readings from before and after.
[Wed Dec 06 12:06:49 MET 2006] stdout: {Heap before GC invocations=1923:
[Wed Dec 06 12:06:49 MET 2006] stdout: Heap
[Wed Dec 06 12:06:49 MET 2006] stdout: PSYoungGen total 393344K, used 8322K [0x35400000, 0x50b00000, 0x50b00000)
[Wed Dec 06 12:06:49 MET 2006] stdout: eden space 337152K, 0% used [0x35400000,0x35400000,0x49d40000)
[Wed Dec 06 12:06:49 MET 2006] stdout: from space 56192K, 14% used [0x49d40000,0x4a560ad8,0x4d420000)
[Wed Dec 06 12:06:49 MET 2006] stdout: to space 56192K, 0% used [0x4d420000,0x4d420000,0x50b00000)
[Wed Dec 06 12:06:49 MET 2006] stdout: PSOldGen total 1214968K, used 1078564K [0x50b00000, 0x9ad7e000, 0xf54000
00)
[Wed Dec 06 12:06:49 MET 2006] stdout: object space 1214968K, 88% used [0x50b00000,0x92849260,0x9ad7e000)
[Wed Dec 06 12:06:49 MET 2006] stdout: PSPermGen total 50688K, used 39889K [0xf5400000, 0xf8580000, 0xf9400000)
[Wed Dec 06 12:06:49 MET 2006] stdout: object space 50688K, 78% used [0xf5400000,0xf7af4640,0xf8580000)
[Wed Dec 06 12:12:11 MET 2006] stdout: 67063.273: [Full GC[Unloading class sun.reflect.GeneratedMethodAccessor378]
[Wed Dec 06 12:12:11 MET 2006] stdout: [Unloading class sun.reflect.GeneratedSerializationConstructorAccessor186]
[Wed Dec 06 12:12:11 MET 2006] stdout: [Unloading class sun.reflect.GeneratedConstructorAccessor120]
[Wed Dec 06 12:12:11 MET 2006] stdout: [Unloading class sun.reflect.GeneratedMethodAccessor352]
[Wed Dec 06 12:12:11 MET 2006] stdout: [Unloading class sun.reflect.GeneratedConstructorAccessor168]
[Wed Dec 06 12:12:11 MET 2006] stdout: [Unloading class sun.reflect.GeneratedMethodAccessor351]
[Wed Dec 06 12:12:11 MET 2006] stdout: [Unloading class sun.reflect.GeneratedMethodAccessor66]
[Wed Dec 06 12:12:11 MET 2006] stdout: [Unloading class sun.reflect.GeneratedConstructorAccessor177]
[Wed Dec 06 12:12:11 MET 2006] stdout: [Unloading class sun.reflect.GeneratedConstructorAccessor164]
[Wed Dec 06 12:12:11 MET 2006] stdout: [Unloading class sun.reflect.GeneratedMethodAccessor376]
[Wed Dec 06 12:12:11 MET 2006] stdout: [Unloading class sun.reflect.GeneratedSerializationConstructorAccessor185]
[Wed Dec 06 12:12:11 MET 2006] stdout: [Unloading class sun.reflect.GeneratedConstructorAccessor78]
[Wed Dec 06 12:12:11 MET 2006] stdout: [Unloading class sun.reflect.GeneratedMethodAccessor381]
[Wed Dec 06 12:12:11 MET 2006] stdout: [Unloading class sun.reflect.GeneratedConstructorAccessor180]
[Wed Dec 06 12:12:11 MET 2006] stdout: [Unloading class sun.reflect.GeneratedConstructorAccessor162]
[Wed Dec 06 12:12:11 MET 2006] stdout: [Unloading class sun.reflect.GeneratedMethodAccessor347]
[Wed Dec 06 12:12:11 MET 2006] stdout: [Unloading class sun.reflect.GeneratedSerializationConstructorAccessor183]
[Wed Dec 06 12:12:11 MET 2006] stdout: [Unloading class sun.reflect.GeneratedMethodAccessor382]
[Wed Dec 06 12:12:11 MET 2006] stdout: [Unloading class sun.reflect.GeneratedConstructorAccessor167]
[Wed Dec 06 12:12:11 MET 2006] stdout: [Unloading class sun.reflect.GeneratedMethodAccessor350]
[Wed Dec 06 12:12:11 MET 2006] stdout: [Unloading class sun.reflect.GeneratedConstructorAccessor179]
[Wed Dec 06 12:12:11 MET 2006] stdout: [Unloading class sun.reflect.GeneratedConstructorAccessor181]
[Wed Dec 06 12:12:11 MET 2006] stdout: [Unloading class sun.reflect.GeneratedMethodAccessor349]
[Wed Dec 06 12:12:11 MET 2006] stdout: [Unloading class sun.reflect.GeneratedSerializationConstructorAccessor184]
[Wed Dec 06 12:12:11 MET 2006] stdout: [Unloading class sun.reflect.GeneratedConstructorAccessor174]
[Wed Dec 06 12:12:11 MET 2006] stdout: [Unloading class sun.reflect.GeneratedSerializationConstructorAccessor69]
[Wed Dec 06 12:12:11 MET 2006] stdout: [Unloading class sun.reflect.GeneratedConstructorAccessor173]
[Wed Dec 06 12:12:11 MET 2006] stdout: [Unloading class sun.reflect.GeneratedSerializationConstructorAccessor1]
[Wed Dec 06 12:12:11 MET 2006] stdout: [Unloading class sun.reflect.GeneratedConstructorAccessor76]
[Wed Dec 06 12:12:11 MET 2006] stdout: [Unloading class sun.reflect.GeneratedSerializationConstructorAccessor182]
[Wed Dec 06 12:12:11 MET 2006] stdout: [Unloading class sun.reflect.GeneratedSerializationConstructorAccessor44]
[Wed Dec 06 12:12:11 MET 2006] stdout: [Unloading class sun.reflect.GeneratedConstructorAccessor169]
[Wed Dec 06 12:12:48 MET 2006] stdout: 1086887K->1023366K(1608312K), 358.9035143 secs]
[Wed Dec 06 12:12:48 MET 2006] stdout: Heap after GC invocations=1923:
[Wed Dec 06 12:12:48 MET 2006] stdout: Heap
[Wed Dec 06 12:12:48 MET 2006] stdout: PSYoungGen total 393344K, used 0K [0x35400000, 0x50b00000, 0x50b00000)
[Wed Dec 06 12:12:48 MET 2006] stdout: eden space 337152K, 0% used [0x35400000,0x35400000,0x49d40000)
[Wed Dec 06 12:12:48 MET 2006] stdout: from space 56192K, 0% used [0x49d40000,0x49d40000,0x4d420000)
[Wed Dec 06 12:12:48 MET 2006] stdout: to space 56192K, 0% used [0x4d420000,0x4d420000,0x50b00000)
[Wed Dec 06 12:12:48 MET 2006] stdout: PSOldGen total 1214968K, used 1023366K [0x50b00000, 0x9ad7e000, 0xf5400000)
[Wed Dec 06 12:12:48 MET 2006] stdout: object space 1214968K, 84% used [0x50b00000,0x8f261810,0x9ad7e000)
[Wed Dec 06 12:12:48 MET 2006] stdout: PSPermGen total 49152K, used 39189K [0xf5400000, 0xf8400000, 0xf9400000)
[Wed Dec 06 12:12:48 MET 2006] stdout: object space 49152K, 79% used [0xf5400000,0xf7a456b8,0xf8400000)
[Wed Dec 06 12:12:48 MET 2006] stdout: } Total time for which application threads were stopped: 358.9442028 seconds
The original JVM paramaters were
vmparam -Xms512m # JVM Minimum Heap Size
vmparam -Xmx3072m # JVM Maximum Heap Size.
vmparam -Xmn439m # JVM New Objects Heap Size
vmparam -XX:MaxPermSize=64m # JVM Max Permanent Heap Size
vmparam -Xss256k # Stack size of threads
The system stopages due to Full GC with class unloading, ranged from 5 minutes to 25 minutes.
1)
This was occurring with the default collectors. The Throughput Collectors (Parallel Scavenge Collector)
was then trialled with the following settings
-XX:+UseParallelGC
-XX:-UseAdaptiveSizePolicy
UseAdaptiveSizePolicy was disabled due to Java Bug ID: 6314461
http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6314461
This did not stop the excessive Full GC pauses from occurring.
2)
We then increased the PermSize and MaxPermSize and still use the Parallel GC
for eden collections.
vmparam -XX:PermSize=128m # Added new parameter
vmparam -XX:MaxPermSize=128m # Increased from 64m
Since the longest pauses with Full GC seemed to directly correspond with the amount
of reflected classes being unloaded, the Permanent space was increased, but this had
no effect. Permanent generation only filled up but only to around 80% and did not reduce
following Full GC and unloading of classes.
3)
The Low Pause Collector for young space was then implemented using
-XX:+UseParNewGC
PermSize and MaxPermSize were kept at 128m but obviously the Throughput Collector
parameter was removed.
This did not have the desired effect.
[Thu Dec 14 03:28:11 MET 2006] stdout: : 1819171K->1021636K(1819264K), 691.9769140 secs] 2247043K->1021636K(2255616K) Heap after GC invocations=1226:
[Thu Dec 14 03:28:11 MET 2006] stdout: Total time for which application threads were stopped: 692.2252804 seconds
4)
The Low Pause Collector for Eden and Permanent are now being trialled
using
-XX:+UseParNewGC
-XX:+UseConcMarkSweepGC
To see does Full GC performance improve or can the application continue while
Full GC be in operation.
Should the Low Pause Collector for Young and Permanent exhibit the same system
delay as has been encountered with the other collectors, does it point specifically
at a potential code issue.
Or can this outage be linked with the Class unloading that is taking place
occasionally as part of Full GC.
System Info
The java version is java version "1.4.2_03"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.2_03-b02)
Java HotSpot(TM) Client VM (build 1.4.2_03-b02, mixed mode)
It is not an option to upgrade to a later full version of java.
OS is SunOS 5.8 Generic_108528-26 sun4u sparc SUNW,Sun-Fire-880
8 cpu machine.
Heap Size seems to be adequate and they appears to be no swapping to disk
while Full GC is occurring to indicate lack of memory on the box.
Message was edited by:
shaneorourke

Just to point out that a similar post was raised prevoiusly by another
user, that seemed to witness the same pauses, see "PermGen not full
but full GC triggerred and classes unloaded"
http://forum.java.sun.com/thread.jspa?threadID=725550&messageID=4186298
Replies to that thread state that it is unlikely that class unloading
would be the source of the delay.
Regardless of how the Full GC is initiated, we have the scenario that
Full GCs collect the same amount of space take a normal duration,
but Full GCs with unloading invariably take longer.
Message was edited by:
shaneorourke

FCPX10.1.1 does not solve the problem with long-time clip editing!

OS: clean installed mac os10.9.1
FCPX: FCPX10.1.1
Project: 4clips, all of the clips is about 1 hour long (dvcprohd)
Disk: 900MB/S++
machine specs:
2*3.06Ghz 6-core
24GB DDR3
and I've tried these graphic cards:
K5000
and
2 5770
all get the same results:
If I double press the "L" key, the response of FCPX is too slow
If I do other operation like browse the clip, or import long time clip,
the FCPX will become too slow to browse the timeline.
I've found the FCPX like to generate audio waves of the clip and
there's no option to shutdown this! I've tried all the options in FCPX like
do not show the waveform of audio in preference and close the audio waveform in timeline
I don't think I can work the project with 10.1.x.
the 10.0.9 also has the 1st problem, but don't have the 2nd problem.
Another project: 2000++ 4K 50P clips(XAVC), but on FCPX 10.0.9, all of the clips is less than 40mins, always 20seconds.
though it will get slower when we import clips day after day,
it's much more smoother than 10.1.1!!!!!!
so,
I don't think we should update to 10.1.x for the little promotion of performance.
and 10.1.x also do not support nvidia K5000 card.
the render is slower than ait5700.....
I hope apple can solve the problem,
all of the above is just basic editing needs!
if the fcpx can not do even a long-time clip editing
why should I use it?

2 project:
1. 4*1 hour clips dvcprohd
that's the problem! I can not bear it.
2. 2000++clips 4K XAVC 50P project which I don't run on FCPX 10.1.1
I run it in fcpx10.0.9, it's fine, but slower when I imported more and more clips.
until now I can bear it.
the fcpx10.1.1 editing long-time clip has problem:
1.
it use 150MB/s harddisk speed to generate the waveform.
I have 900MB/s disk speed, so that's not the problem,
but it generate all the time!
1 hour clip's wavefrom generates for 1 hour without stopping, if I stop it , the fcpx crashed!
2.
when I skimming the clip for editing, the fcpx gets slower, always 2mins to response my operation.
3.
when I double press J or L key, the fcpx will need about 1 min to response.
the FCPX10.0.9 editing long-time clip problem:
the fcpx10.0.9 can handle the long-time clips, but also has very slow response when I doulbe press J or L key.

Problem with long pauses in Tenured collection

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