Re: [GRASS-dev] [GRASS GIS] #1625: Disk performance degrades by several orders of magnitude on two processes

[GRASS GIS]

#1625: Disk performance degrades by several orders of magnitude on two processes
--+-
  Reporter:  sprice   |  Owner:  grass-dev@…
  Type:  defect   | Status:  closed
  Priority:  normal   |  Milestone:  7.0.7
 Component:  Default  |Version:  svn-trunk
Resolution:  wontfix  |   Keywords:
   CPU:  x86-64   |   Platform:  MacOSX
--+-
Changes (by martinl):

 * status:  new => closed
 * resolution:   => wontfix


-- 
Ticket URL: 
GRASS GIS 

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Re: [GRASS-dev] [GRASS GIS] #1625: Disk performance degrades by several orders of magnitude on two processes

[GRASS GIS]

#1625: Disk performance degrades by several orders of magnitude on two processes
--+-
  Reporter:  sprice   |  Owner:  grass-dev@…
  Type:  defect   | Status:  new
  Priority:  normal   |  Milestone:  7.0.7
 Component:  Default  |Version:  svn-trunk
Resolution:   |   Keywords:
   CPU:  x86-64   |   Platform:  MacOSX
--+-

Comment (by martinl):

 No activity for a long time. Closing. Feel free to reopen if needed.

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Ticket URL: 
GRASS GIS 

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Re: [GRASS-dev] [GRASS GIS] #1625: Disk performance degrades by several orders of magnitude on two processes

[GRASS GIS]

#1625: Disk performance degrades by several orders of magnitude on two processes
-+--
 Reporter:  sprice   |   Owner:  grass-dev@…  
 Type:  defect   |  Status:  new  
 Priority:  normal   |   Milestone:  7.0.0
Component:  Default  | Version:  svn-trunk
 Keywords:   |Platform:  MacOSX   
  Cpu:  x86-64   |  
-+--

Comment(by wenzeslaus):

 Replying to [comment:4 hamish]:
  is there anything to be done for this ticket? or is it just an
 observation?

 I don't know. Perhaps writing a a benchmark/test which will test/show that
 two processes in parallel behaves as expected.

-- 
Ticket URL: http://trac.osgeo.org/grass/ticket/1625#comment:5
GRASS GIS http://grass.osgeo.org

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Re: [GRASS-dev] [GRASS GIS] #1625: Disk performance degrades by several orders of magnitude on two processes

[GRASS GIS]

#1625: Disk performance degrades by several orders of magnitude on two processes
-+--
 Reporter:  sprice   |   Owner:  grass-dev@…  
 Type:  defect   |  Status:  new  
 Priority:  normal   |   Milestone:  7.0.0
Component:  Default  | Version:  svn-trunk
 Keywords:   |Platform:  MacOSX   
  Cpu:  x86-64   |  
-+--

Comment(by hamish):

 is there anything to be done for this ticket? or is it just an
 observation?

-- 
Ticket URL: https://trac.osgeo.org/grass/ticket/1625#comment:4
GRASS GIS http://grass.osgeo.org

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[GRASS-dev] [GRASS GIS] #1625: Disk performance degrades by several orders of magnitude on two processes

[GRASS GIS]

#1625: Disk performance degrades by several orders of magnitude on two processes
-+--
 Reporter:  sprice   |   Owner:  grass-dev@…  
 Type:  defect   |  Status:  new  
 Priority:  normal   |   Milestone:  7.0.0
Component:  Default  | Version:  svn-trunk
 Keywords:   |Platform:  MacOSX   
  Cpu:  x86-64   |  
-+--
 When there are two GRASS process competing for a single disk on an I/O
 bound task, performance doesn't just half. It decreases by several orders
 of magnitude. However, 'iostat' lists just as much data flowing off the
 disk as would be expected.

 Also, when one task is canceled, the other process doesn't recover.
 'iostat' claims that just as much data is flowing, but the remaining
 process remains degraded until it is canceled and restarted.

 I'd try to give a bit more debug info, but I suspect that it's some sort
 of interaction with a caching layer in GRASS where extra data is read, and
 then discarded, many times.

-- 
Ticket URL: http://trac.osgeo.org/grass/ticket/1625
GRASS GIS http://grass.osgeo.org

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