MultiThreading and Java IO

Hello All,
I have my application running under JBoss 3.2.5 deployed as MBeans.
All I do in my process is connect to DB (Oracle 8i) create serializedObjects for 1 months data and save it to a folder on the Harddisk. THe size of these objects is approximately 1MB each. When my process runs the 2nd iteration (once per day), it reads this object to get data for 29 days and connects to the DB to fetch data for the current day to complete 30 days, Generates the Object and saves it to the disk. When I have a single process running, It reads quickly from the cache and generates object.
My problem is when I run the process in multithreads wherein I have 25 - 50 of such Threads in the JVM, it takes awefully long time to generate the files. For eg, while 1 thread takes 3 mins to create a new object, 25 threads in parallel (each reading/writing different files) takes around 1 hr to complete their object.
Could anyone help me understand my problem. THe server that I have Jboss installed on is an 8 CPU 2.8GHz each box with 8GB RAM running Windows 2003 OS.
Thanks.

Parallel thread execution does not help after a certain number of threads because the processor is not actually processing them in parallel. Parallel processing is not truly parallel processing in the strictest sense. The threads are actually queued with time sliced for a single or multiple processor(s) as may be available. That's where multiple processors make a difference, but there will be a limit to the number of processors. Hence, you will not benefit from starting too many threads.
http://www-128.ibm.com/developerworks/library/j-thread.html
Threads may be supported by having many hardware processors, by time-slicing a single hardware processor, or by time-slicing many hardware processors.
http://java.sun.com/docs/books/jls/third_edition/html/memory.html

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trc file: "dev_w0", trc level: 1, release: "700"
ACTIVE TRACE LEVEL           1
ACTIVE TRACE COMPONENTS      all, MJ
B
B Wed Aug 31 15:45:40 2011
B create_con (con_name=R/3)
B Loading DB library 'D:\usr\sap\CUS\DVEBMGS04\exe\dboraslib.dll' ...
B Library 'D:\usr\sap\CUS\DVEBMGS04\exe\dboraslib.dll' loaded
B Version of 'D:\usr\sap\CUS\DVEBMGS04\exe\dboraslib.dll' is "700.08", patchlevel (0.46)
B New connection 0 created
M sysno      04
M sid        CUS
M systemid   560 (PC with Windows NT)
M relno      7000
M patchlevel 0
M patchno    52
M intno      20050900
M make:      multithreaded, Unicode, optimized
M pid        456
M
M kernel runs with dp version 210000(ext=109000) (@(#) DPLIB-INT-VERSION-210000-UC)
M length of sys_adm_ext is 572 bytes
M ***LOG Q0Q=> tskh_init, WPStart (Workproc 0 456) [dpxxdisp.c   1293]
I MtxInit: 30000 0 0
M DpSysAdmExtCreate: ABAP is active
M DpSysAdmExtCreate: VMC (JAVA VM in WP) is not active
M DpShMCreate: sizeof(wp_adm)          18304     (1408)
M DpShMCreate: sizeof(tm_adm)          3954072     (19672)
M DpShMCreate: sizeof(wp_ca_adm)          24000     (80)
M DpShMCreate: sizeof(appc_ca_adm)     8000     (80)
M DpCommTableSize: max/headSize/ftSize/tableSize=500/8/528056/528064
M DpShMCreate: sizeof(comm_adm)          528064     (1048)
M DpFileTableSize: max/headSize/ftSize/tableSize=0/0/0/0
M DpShMCreate: sizeof(file_adm)          0     (72)
M DpShMCreate: sizeof(vmc_adm)          0     (1452)
M DpShMCreate: sizeof(wall_adm)          (38456/34360/64/184)
M DpShMCreate: sizeof(gw_adm)     48
M DpShMCreate: SHM_DP_ADM_KEY          (addr: 05C00040, size: 4613144)
M DpShMCreate: allocated sys_adm at 05C00040
M DpShMCreate: allocated wp_adm at 05C01E28
M DpShMCreate: allocated tm_adm_list at 05C065A8
M DpShMCreate: allocated tm_adm at 05C065D8
M DpShMCreate: allocated wp_ca_adm at 05FCBB70
M DpShMCreate: allocated appc_ca_adm at 05FD1930
M DpShMCreate: allocated comm_adm at 05FD3870
M DpShMCreate: system runs without file table
M DpShMCreate: allocated vmc_adm_list at 06054730
M DpShMCreate: allocated gw_adm at 06054770
M DpShMCreate: system runs without vmc_adm
M DpShMCreate: allocated ca_info at 060547A0
M DpShMCreate: allocated wall_adm at 060547A8
X EmInit: MmSetImplementation( 2 ).
X MM diagnostic options set: 0
X <ES> client 0 initializing ....
X Using implementation flat
M <EsNT> Memory Reset disabled as NT default
X ES initialized.
M
M Wed Aug 31 15:45:41 2011
M ThInit: running on host crmsys
M
M Wed Aug 31 15:45:42 2011
M calling db_connect ...
C Prepending D:\usr\sap\CUS\DVEBMGS04\exe to Path.
C
C Wed Aug 31 15:45:47 2011
C Client NLS settings: AMERICAN_AMERICA.UTF8
C Logon as OPS$-user to get SAPSR3's password
C Connecting as /@CRM on connection 0 (nls_hdl 0) ... (dbsl 700 240106)
C Nls CharacterSet                 NationalCharSet              C      EnvHp      ErrHp ErrHpBatch
C    0 UTF8                                                      1   0619F158   061A46F4   061A3F7C
C Attaching to DB Server CRM (con_hdl=0,svchp=061A3EC8,svrhp=061B5794)
C Starting user session (con_hdl=0,svchp=061A3EC8,srvhp=061B5794,usrhp=061CA558)
C
C Wed Aug 31 15:45:48 2011
C Now '/@CRM' is connected (con_hdl 0, nls_hdl 0).
C Got SAPSR3's password from OPS$-user
C Disconnecting from connection 0 ...
C Closing user session (con_hdl=0,svchp=061A3EC8,usrhp=061CA558)
C Now I'm disconnected from ORACLE
C Connecting as SAPSR3/<pwd>@CRM on connection 0 (nls_hdl 0) ... (dbsl 700 240106)
C Nls CharacterSet                 NationalCharSet              C      EnvHp      ErrHp ErrHpBatch
C    0 UTF8                                                      1   0619F158   061A46F4   061A3F7C
C Starting user session (con_hdl=0,svchp=061A3EC8,srvhp=061B5794,usrhp=061CA558)
C Now 'SAPSR3/<pwd>@CRM' is connected (con_hdl 0, nls_hdl 0).
C Database NLS settings: AMERICAN_AMERICA.UTF8
C Database instance CRM is running on CRMSYS with ORACLE version 10.2.0.1.0 since 20110831
B
B Wed Aug 31 15:45:49 2011
B Connection 0 opened (DBSL handle 0)
B Wp Hdl ConName          ConId     ConState     TX PRM RCT TIM MAX OPT Date     Time   DBHost
B 000 000 R/3              000000000 ACTIVE       NO YES NO 000 255 255 20110831 154542 CRMSYS
M db_connect o.k.
M ICT: exclude compression: .zip,.cs,.rar,.arj,.z,.gz,.tar,.lzh,.cab,.hqx,.ace,.jar,.ear,.war,.css,.pdf,.js,.gzip,.uue,.bz2,.iso,.sda,.sar,.gif
I
I Wed Aug 31 15:46:12 2011
I MtxInit: 0 0 0
M SHM_PRES_BUF               (addr: 0A7C0040, size: 4400000)
M SHM_ROLL_AREA          (addr: 788A0040, size: 61440000)
M SHM_PAGING_AREA          (addr: 0AC00040, size: 32768000)
M SHM_ROLL_ADM               (addr: 0CB50040, size: 615040)
M SHM_PAGING_ADM          (addr: 0CBF0040, size: 525344)
M ThCreateNoBuffer          allocated 544152 bytes for 1000 entries at 0CC80040
M ThCreateNoBuffer          index size: 3000 elems
M ThCreateVBAdm          allocated 12160 bytes (50 server) at 0CD10040
X EmInit: MmSetImplementation( 2 ).
X MM diagnostic options set: 0
X <ES> client 0 initializing ....
X Using implementation flat
X ES initialized.
B db_con_shm_ini: WP_ID = 0, WP_CNT = 13, CON_ID = -1
B dbtbxbuf: Buffer TABL (addr: 10E700C8, size: 30000000, end: 12B0C448)
B dbtbxbuf: Buffer TABLP (addr: 12B100C8, size: 10240000, end: 134D40C8)
B dbexpbuf: Buffer EIBUF (addr: 0FBA00D0, size: 4194304, end: 0FFA00D0)
B dbexpbuf: Buffer ESM   (addr: 134E00D0, size: 4194304, end: 138E00D0)
B dbexpbuf: Buffer CUA   (addr: 138F00D0, size: 3072000, end: 13BDE0D0)
B dbexpbuf: Buffer OTR   (addr: 13BE00D0, size: 4194304, end: 13FE00D0)
M rdisp/reinitialize_code_page -> 0
M icm/accept_remote_trace_level -> 0
M rdisp/no_hooks_for_sqlbreak -> 0
M CCMS: AlInitGlobals : alert/use_sema_lock = TRUE.
S
S Wed Aug 31 15:46:15 2011
S *** init spool environment
S initialize debug system
T Stack direction is downwards.
T debug control: prepare exclude for printer trace
T new memory block 1946AA80
S
S Wed Aug 31 15:46:16 2011
S spool kernel/ddic check: Ok
S using table TSP02FX for frontend printing
S 1 spool work process(es) found
S frontend print via spool service enabled
S printer list size is 150
S printer type list size is 50
S queue size (profile)   = 300
S hostspool list size = 3000
S option list size is 30
S      found processing queue enabled
S found spool memory service RSPO-RCLOCKS at 1D6D00A8
S doing lock recovery
S setting server cache root
S found spool memory service RSPO-SERVERCACHE at 1D6D0430
S    using messages for server info
S size of spec char cache entry: 297028 bytes (timeout 100 sec)
S size of open spool request entry: 2132 bytes
S immediate print option for implicitely closed spool requests is disabled
A
A Wed Aug 31 15:46:18 2011
A
A -PXA--
A PXA INITIALIZATION
A PXA: Fragment Size too small: 73 MB, reducing # of fragments
A System page size: 4kb, total admin_size: 5132kb, dir_size: 5076kb.
A Attached to PXA (address 688A0040, size 150000K)
A abap/pxa = shared protect gen_remote
A PXA INITIALIZATION FINISHED
A -PXA--
A
A
A Wed Aug 31 15:46:20 2011
A ABAP ShmAdm attached (addr=57A40000 leng=20955136 end=58E3C000)
A >> Shm MMADM area (addr=57EB5E58 leng=126176 end=57ED4B38)
A >> Shm MMDAT area (addr=57ED5000 leng=16150528 end=58E3C000)
A RFC Destination> destination crmsys_CUS_04 host crmsys system CUS systnr 4 (crmsys_CUS_04)
A
A Wed Aug 31 15:46:21 2011
A RFC Options> H=crmsys,S=04,d=2,
A RFC FRFC> fallback activ but this is not a central instance.
A
A RFC rfc/signon_error_log = -1
A RFC rfc/dump_connection_info = 0
A RFC rfc/dump_client_info = 0
A RFC rfc/cp_convert/ignore_error = 1
A RFC rfc/cp_convert/conversion_char = 23
A RFC rfc/wan_compress/threshold = 251
A RFC rfc/recorder_pcs not set, use defaule value: 2
A RFC rfc/delta_trc_level not set, use default value: 0
A RFC rfc/no_uuid_check not set, use default value: 0
A RFC rfc/bc_ignore_thcmaccp_retcode not set, use default value: 0
A RFC Method> initialize RemObjDriver for ABAP Objects
M ThrCreateShObjects          allocated 13730 bytes at 0FFB0040
N
N Wed Aug 31 15:46:22 2011
N SsfSapSecin: putenv(SECUDIR=D:\usr\sap\CUS\DVEBMGS04\sec): ok
N
N =================================================
N === SSF INITIALIZATION:
N ===...SSF Security Toolkit name SAPSECULIB .
N ===...SSF trace level is 0 .
N ===...SSF library is D:\usr\sap\CUS\DVEBMGS04\exe\sapsecu.dll .
N ===...SSF hash algorithm is SHA1 .
N ===...SSF symmetric encryption algorithm is DES-CBC .
N ===...sucessfully completed.
N =================================================
N
N Wed Aug 31 15:46:23 2011
N MskiInitLogonTicketCacheHandle: Logon Ticket cache pointer retrieved from shared memory.
N MskiInitLogonTicketCacheHandle: Workprocess runs with Logon Ticket cache.
M JrfcVmcRegisterNativesDriver o.k.
W =================================================
W === ipl_Init() called
B    dbtran INFO (init_connection '<DEFAULT>' [ORACLE:700.08]):
B     max_blocking_factor = 15, max_in_blocking_factor      =   5,
B     min_blocking_factor = 10, min_in_blocking_factor      =   5,
B     prefer_union_all    =   0, prefer_join                 =   0,
B     prefer_fix_blocking =   0, prefer_in_itab_opt          =   1,
B     convert AVG         =   0, alias table FUPD            =   0,
B     escape_as_literal   =   1, opt GE LE to BETWEEN        =   0,
B     select *            =0x0f, character encoding          = STD / <none>:-,
B     use_hints           = abap->1, dbif->0x1, upto->2147483647, rule_in->0,
B                           rule_fae->0, concat_fae->0, concat_fae_or->0
W
W Wed Aug 31 15:46:24 2011
W    ITS Plugin: Path dw_gui
W    ITS Plugin: Description ITS Plugin - ITS rendering DLL
W    ITS Plugin: sizeof(SAP_UC) 2
W    ITS Plugin: Release: 700, [7000.0.52.20050900]
W    ITS Plugin: Int.version, [32]
W    ITS Plugin: Feature set: [10]
W    ===... Calling itsp_Init in external dll ===>
W === ipl_Init() returns 0, ITSPE_OK: OK
W =================================================
E Enqueue Info: rdisp/wp_no_enq=1, rdisp/enqname=<empty>, assume crmsys_CUS_04
E Replication is disabled
E EnqCcInitialize: local lock table initialization o.k.
E EnqId_SuppressIpc: local EnqId initialization o.k.
E EnqCcInitialize: local enqueue client init o.k.
B
B Wed Aug 31 15:46:48 2011
B table logging switched off for all clients
M
M Wed Aug 31 15:47:55 2011
M SecAudit(RsauShmInit): WP attached to existing shared memory.
M SecAudit(RsauShmInit): addr of SCSA........... = 05BD0040
M SecAudit(RsauShmInit): addr of RSAUSHM........ = 05BD07A8
M SecAudit(RsauShmInit): addr of RSAUSLOTINFO... = 05BD07E0
M SecAudit(RsauShmInit): addr of RSAUSLOTS...... = 05BD07EC
A
A Wed Aug 31 15:48:44 2011
A RFC FRFC> fallback on the central gateway crmsys sapgw04 activ
B
B Wed Aug 31 15:49:47 2011
B dbmyclu : info : my major identification is 3232288873, minor one 4.
B dbmyclu : info : Time Reference is 1.12.2001 00:00:00h GMT.
B dbmyclu : info : my initial uuid is D98FA690E8AA314D9B69930868792664.
B dbmyclu : info : current optimistic cluster level: 0
B dbmyclu : info : pessimistic reads set to 2.

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ShubhaPradeep wrote:
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[https://www.centos.org/modules/newbb/viewtopic.php?post_id=95784&topic_id=11661]

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Sorry folks, I just found out the reason. Its because there was no data in the combination what I was extracting.
but is this the right error message for that? It should have atleast create a blank file right?

I continually get a Java error. I've uninstalled and reinstalled firefox and nothing has helped. I've updated flash and Java.

I have used Firefox as my default browser for many years. I've recently started getting a Java error message. It pops up continually. I have updated flash and java. I have uninstalled and re-installed Firefox and nothing has helped. I have had to start using Chrome instead of Firefox which I don't care for but I don't have the java error with Chrome. How do I fix this problem? The error reads as follows:
Java Script Application
Error: syntax error

Your '''JavaScript''' error has nothing to do with the Java plugin . It is likely caused by an added extension (the earlier forum threads [/questions/944619] and [/questions/943088] mention disabling or updating the Social Fixer extension will resolve the problem).
You can read this article for help troubleshooting your extensions: [[Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems]]

MultiThreading and Java IO

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