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Created Date:2014-08-25
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kevin closson's blog: platforms, databases and storage platform, database and storage topics blog papers, webcasts, etc misc slob resources about index of posts sneak preview of pgio (the slob method for postgresql) part iv: how to reduce the amount of memory in the linux page cache for testing purposes. published may 23, 2018 oracle 3 comments i hope these sneak peeks are of interest… postgresql and buffered i/o postgresql uses buffered i/o. if you want to test your storage subsystem capabilities with database physical i/o you have to get the os page cache “out of the way”–unless you want to load really large test data sets. although pgio (the slob method for postgresql) is still in beta, i’d like to show this example of the tool i provide for users to make a really large ram system into an effectively smaller ram system. linux huge pages memory allocated to huge pages is completely cordoned off unless a process allocates some ipc shared memory (shmget(1)). the pgio kit comes with a simple tools called pgio_reduce_free_memory.sh which leverages this quality of huge pages in order to draw down available memory so that one can test physical i/o with a database size that is quite smaller than the amount of physical memory in the database host. the following picture shows an example of using pgio_reduce_free_memory.sh to draw set aside 443 gigabytes of available memory so as to leave only 32 gigabytes for os page cache. as such, one can test a pgio database of, say, 64 gigabytes and generate a tremendous about of physical i/o. i should think this little tool could be helpful for a lot of testing purposes beyond pgio. share this: facebook linkedin reddit twitter google like this: like loading... sneak preview of pgio (the slob method for postgresql) part iii: link to the full readme file for beta pgio v0.9. published may 22, 2018 oracle 3 comments if you are interested in a head start on pgio, the following is a link to the full readme file which has some loading and testing how-to: the pgio text readme file version 0.9 beta share this: facebook linkedin reddit twitter google like this: like loading... sneak preview of pgio (the slob method for postgresql) part ii: bulk data loading. published may 22, 2018 oracle 1 comment bulk data loading with pgio version 0.9 beta now that pgio (the slob method for postgresql) is in beta users’ hands i’m going to make a few quick blog entries with examples of pgio usage. the following are screen grabs taken while loading 1 terabyte into the pgio schemas. as the example shows, pgio (on a system with ample storage performance) can ready a 1 terabyte data set for testing in only 1014 seconds (roughly 3.5tb/h loading rate). $ cat pgio.conf update_pct=0 run_time=120 num_schemas=4 num_threads=2 work_unit=255 update_work_unit=8 scale=1g dbname=pg10 connect_string=”pg10″ create_base_table=true $ echo ” > update_pct=0 > run_time=120 > num_schemas=64 > num_threads=16 > work_unit=255 > update_work_unit=8 > scale=16g > dbname=pg10 > connect_string=\”pg10\” > create_base_table=true ” > pgio.conf $ $ sh ./setup.sh job info: loading 16g scale into 64 schemas as per pgio.conf->num_schemas. batching info: loading 16 schemas per batch as per pgio.conf->num_threads. base table loading time: 23 seconds. waiting for batch. global schema count: 16. elapsed: 0 seconds. waiting for batch. global schema count: 31. elapsed: 243 seconds. waiting for batch. global schema count: 46. elapsed: 475 seconds. waiting for batch. global schema count: 61. elapsed: 697 seconds. waiting for batch. global schema count: 64. elapsed: 935 seconds. group data loading phase complete. elapsed: 1014 seconds. $ $ psql pg10 psql (10.0) type “help” for help. pg10=# \d+ list of relations schema | name | type | owner | size | description ——–+——————+——-+———-+————+————- public | pgio1 | table | postgres | 16 gb | public | pgio10 | table | postgres | 16 gb | public | pgio11 | table | postgres | 16 gb | public | pgio12 | table | postgres | 16 gb | public | pgio13 | table | postgres | 16 gb | public | pgio14 | table | postgres | 16 gb | public | pgio15 | table | postgres | 16 gb | public | pgio16 | table | postgres | 16 gb | public | pgio17 | table | postgres | 16 gb | public | pgio18 | table | postgres | 16 gb | public | pgio19 | table | postgres | 16 gb | public | pgio2 | table | postgres | 16 gb | public | pgio20 | table | postgres | 16 gb | public | pgio21 | table | postgres | 16 gb | public | pgio22 | table | postgres | 16 gb | public | pgio23 | table | postgres | 16 gb | public | pgio24 | table | postgres | 16 gb | public | pgio25 | table | postgres | 16 gb | public | pgio26 | table | postgres | 16 gb | public | pgio27 | table | postgres | 16 gb | public | pgio28 | table | postgres | 16 gb | public | pgio29 | table | postgres | 16 gb | public | pgio3 | table | postgres | 16 gb | public | pgio30 | table | postgres | 16 gb | public | pgio31 | table | postgres | 16 gb | public | pgio32 | table | postgres | 16 gb | public | pgio33 | table | postgres | 16 gb | public | pgio34 | table | postgres | 16 gb | public | pgio35 | table | postgres | 16 gb | public | pgio36 | table | postgres | 16 gb | public | pgio37 | table | postgres | 16 gb | public | pgio38 | table | postgres | 16 gb | public | pgio39 | table | postgres | 16 gb | public | pgio4 | table | postgres | 16 gb | share this: facebook linkedin reddit twitter google like this: like loading... sneak preview of pgio (the slob method for postgresql) part i: the beta pgio readme file. published may 22, 2018 oracle 2 comments the pgio kit is the only authorized port of the slob method for postgresql. i’ve been handing out beta kits to some folks already but i thought i’d get some blog posts underway in anticipation of users’ interest. the following is part of the readme.txt for pgio v0.9 (beta). slob users will find it all easy to understand. this is the section of the readme that discusses pgio.conf parameters: update_pct the percentage of sql that will be update dml run_time runit.sh run duration in seconds num_schemas pgio data is loaded into either a big single schema or multiple. num_schemas directs setup.sh to create and load num_schemas schemas. num_threads for setup.sh: this parameter controls the number of concurrent data loading streams. for runit.sh: this parameter controls how many sessions will attach to each num_schemas schema. for example, if num_schemas is set to 32 and num_threads is set to 8, setup.sh will load data into 32 schemas in batches of 8 concurrent data loading streams. on the other hand, if set to the same 32 and 8 respectively for num_schemas and num_threads then runit.sh will run 8 sessions accessing each of the 32 schemas for a total of 256 sessions. work_unit controls the bounds of the between clause for each select statement as it executes. for example, if set to 255 each select will visit 255 random blocks. smaller values require more sql executions to drive the same iops. update_work_unit the update dml corollary for work_unit. this allows for a mixed select/update workload where select statements can visit more blocks than updates. scale the amount of data to load into each schema. values can be n as a number of 8kb blocks or n modified with [mg] for megabytes or gigabytes. for example, if set to 1024 setup.sh will load 8mb ( 1024 * 8192 bytes) into each schema whereas set to 1024m will load 1024 megabytes into each schema. dbname the postgresql database that holds the pgio objects connect_string this parameter is passed to the psql command. the pgio kit expects that .pgpass and all other authentication is configured. for example, if connect_string is set to “pg10” then the following command must succeed in your pgio environment: $ psql pg10 create_base_table the loader, setup.sh, creates a dense “seed” table as the source from which to load the test tables. this seed table persists after setup.sh exits. if this parameter is set to true the seed ta

URL analysis for kevinclosson.net


https://kevinclosson.net/tag/netezza-oracle/
https://kevinclosson.net/2018/04/16/slob-can-now-be-downloaded-from-github/?share=reddit
https://kevinclosson.net/2018/05/22/sneak-preview-of-pgio-the-slob-method-for-postgressql-part-i-the-beta-pgio-readme-file/
https://kevinclosson.net/2018/05/22/sneak-preview-of-pgio-the-slob-method-for-postgresql-part-iii-link-to-the-full-readme-file-for-beta-pgio-v0-9/?share=reddit
https://kevinclosson.net/tag/whitepaper/
https://kevinclosson.net/2018/04/04/whitepaper-announcement-migrating-oracle-database-workloads-to-oracle-linux-on-aws/?share=linkedin
https://kevinclosson.net/2018/03/31/white-paper-announcement-benchmarking-amazon-aurora/
https://kevinclosson.net/tag/slob-testing/
https://kevinclosson.net/slob
https://kevinclosson.net/tag/openworld/
https://kevinclosson.net/tag/slob/
https://kevinclosson.net/2018/05/22/sneak-preview-of-pgio-the-slob-method-for-postgresql-part-ii-bulk-data-loading/?share=google-plus-1
https://kevinclosson.net/tag/exadata-storage-grid/
https://kevinclosson.net/2018/05/22/sneak-preview-of-pgio-the-slob-method-for-postgressql-part-i-the-beta-pgio-readme-file/?share=reddit
https://kevinclosson.net/2018/05/22/sneak-preview-of-pgio-the-slob-method-for-postgressql-part-i-the-beta-pgio-readme-file/#comment-80639

Whois Information


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Domain Name: KEVINCLOSSON.NET
Registry Domain ID: 1872728878_DOMAIN_NET-VRSN
Registrar WHOIS Server: whois.wildwestdomains.com
Registrar URL: http://www.wildwestdomains.com
Updated Date: 2018-07-30T17:21:36Z
Creation Date: 2014-08-25T20:07:16Z
Registry Expiry Date: 2019-08-25T20:07:16Z
Registrar: Wild West Domains, LLC
Registrar IANA ID: 440
Registrar Abuse Contact Email: [email protected]
Registrar Abuse Contact Phone: 480-624-2505
Domain Status: clientDeleteProhibited https://icann.org/epp#clientDeleteProhibited
Domain Status: clientRenewProhibited https://icann.org/epp#clientRenewProhibited
Domain Status: clientTransferProhibited https://icann.org/epp#clientTransferProhibited
Domain Status: clientUpdateProhibited https://icann.org/epp#clientUpdateProhibited
Name Server: NS1.WORDPRESS.COM
Name Server: NS2.WORDPRESS.COM
DNSSEC: unsigned
URL of the ICANN Whois Inaccuracy Complaint Form: https://www.icann.org/wicf/
>>> Last update of whois database: 2019-01-24T17:55:48Z <<<

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  REGISTRAR Wild West Domains, LLC

SERVERS

  SERVER net.whois-servers.net

  ARGS domain =kevinclosson.net

  PORT 43

  TYPE domain

DOMAIN

  NAME kevinclosson.net

  CHANGED 2018-07-30

  CREATED 2014-08-25

STATUS
clientDeleteProhibited https://icann.org/epp#clientDeleteProhibited
clientRenewProhibited https://icann.org/epp#clientRenewProhibited
clientTransferProhibited https://icann.org/epp#clientTransferProhibited
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NSERVER

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  NS2.WORDPRESS.COM 198.181.117.9

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