Difference between revisions of "Data accumulation rate"

From MCEWiki
Line 1: Line 1:
This page gives some rules for estimating the data accumulation rate for a running MCE.
+
This page gives some rules for estimating the accumulation rate of data on disk for a running MCE.
  
In general, during a regular acquisition, the data rate of a MCE is:
+
In general, during a regular acquisition, the data rate of an MCE is:
  
 
:<math>S_w \times N_c \times N_r \times R</math>
 
:<math>S_w \times N_c \times N_r \times R</math>
Line 25: Line 25:
 
! 300 Hz
 
! 300 Hz
 
! 400 Hz
 
! 400 Hz
 +
! 600 Hz
 
|-
 
|-
 
! 25 rows
 
! 25 rows
Line 31: Line 32:
 
| 1.6
 
| 1.6
 
| 2.1
 
| 2.1
 +
| 3.2
 
|-
 
|-
 
! 33 rows
 
! 33 rows
Line 37: Line 39:
 
| 2.1
 
| 2.1
 
| 2.8
 
| 2.8
 +
| 4.2
 
|-
 
|-
 
! 41 rows
 
! 41 rows
Line 43: Line 46:
 
| 2.6
 
| 2.6
 
| 3.5
 
| 3.5
 +
| 5.3
 
|}
 
|}
  
Line 54: Line 58:
 
! 300 Hz
 
! 300 Hz
 
! 400 Hz
 
! 400 Hz
 +
! 600 Hz
 
|-
 
|-
 
! 25 rows
 
! 25 rows
Line 60: Line 65:
 
| 38.6
 
| 38.6
 
| 51.5
 
| 51.5
 +
| 77.2
 
|-
 
|-
 
! 33 rows
 
! 33 rows
Line 66: Line 72:
 
| 51.0
 
| 51.0
 
| 68.0
 
| 68.0
 +
| 102.0
 
|-
 
|-
 
! 41 rows
 
! 41 rows
Line 72: Line 79:
 
| 63.3
 
| 63.3
 
| 84.5
 
| 84.5
 +
| 126.7
 
|}
 
|}

Revision as of 16:47, 9 October 2012

This page gives some rules for estimating the accumulation rate of data on disk for a running MCE.

In general, during a regular acquisition, the data rate of an MCE is:

<math>S_w \times N_c \times N_r \times R</math>

where:

  • <math>S_w</math> is the word size (=32 bits)
  • <math>N_c</math> is the number of columns read (<math>=8 \times N_{RC}</math>, where <math>N_{RC}</math> is the number of readout cards used)
  • <math>N_r</math> is the number of rows read
  • <math>R</math> is the read-out data rate

A useful approximation is:

a single readout card reading 41 rows at 400 Hz is <math>\approx0.5</math> megabytes/second.

Here's are some tables of accumulation rates for a two readout card 48HP subrack (multiply by 2 for a full sized 72HP subrack with 4 readout cards) for various data rates and numbers of rows:

48HP subrack data accumulation rate in Gigabytes (<math>10^9</math> bytes) per hour
150 Hz 200 Hz 300 Hz 400 Hz 600 Hz
25 rows 0.8 1.1 1.6 2.1 3.2
33 rows 1.1 1.4 2.1 2.8 4.2
41 rows 1.3 1.8 2.6 3.5 5.3


48HP subrack data accumulation rate in Gigabytes (<math>10^9</math> bytes) per day
150 Hz 200 Hz 300 Hz 400 Hz 600 Hz
25 rows 19.3 25.7 38.6 51.5 77.2
33 rows 25.5 34.0 51.0 68.0 102.0
41 rows 31.7 42.2 63.3 84.5 126.7