Difference between revisions of "Data accumulation rate"

From MCEWiki
Line 15: Line 15:
 
: a single readout card reading 41 rows at 400 Hz is <math>\approx0.5</math> megabytes/second.
 
: 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:
+
== Tables ==
 +
Here are some tables of accumulation rates for both kinds of subracks for various data rates and numbers of rows:
  
−
{| class="wikitable"
+
{| class="wikitable" style="text-align: right"
−
|+ 48HP subrack data accumulation rate in Gigabytes (<math>10^9</math>&nbsp;bytes) per hour
+
|+ MCE data accumulation rate in Megabits per second (Mbps)
 +
|-
 +
! rowspan="2" | &nbsp;
 +
! colspan="4" | 48HP
 +
! rowspan="5" | &nbsp;
 +
! colspan="4" | 72HP
 
|-
 
|-
−
!
 
 
! 100 Hz
 
! 100 Hz
 
! 150 Hz
 
! 150 Hz
 
! 200 Hz
 
! 200 Hz
−
! 300 Hz
 
 
! 400 Hz
 
! 400 Hz
−
! 600 Hz
+
! 100 Hz
 +
! 150 Hz
 +
! 200 Hz
 +
! 400 Hz
 
|-
 
|-
 
! 25 rows
 
! 25 rows
−
| 0.55
+
| 1.28
−
| 0.8
+
| 1.92
−
| 1.1
+
| 2.56
−
| 1.6
+
| 5.12
−
| 2.1
+
| 2.56
−
| 3.2
+
| 3.84
 +
| 5.12
 +
| 10.24
 
|-
 
|-
 
! 33 rows
 
! 33 rows
−
| 0.7
+
| 1.69
−
| 1.1
+
| 2.53
−
| 1.4
+
| 3.38
−
| 2.1
+
| 6.76
−
| 2.8
+
| 3.38
−
| 4.2
+
| 5.07
 +
| 6.76
 +
| 13.52
 
|-
 
|-
 
! 41 rows
 
! 41 rows
−
| 0.9
+
| 0.94
−
| 1.3
+
| 1.42
−
| 1.8
+
| 1.89
−
| 2.6
+
| 3.78
−
| 3.5
+
| 1.42
−
| 5.3
+
| 2.83
 +
| 3.78
 +
| 7.56
 
|}
 
|}
  
  
−
{| class="wikitable"
+
{| class="wikitable" style="text-align: right"
−
|+ 48HP subrack data accumulation rate in Gigabytes (<math>10^9</math>&nbsp;bytes) per day
+
|+ MCE data accumulation rate in Gigabytes (10<sup>9</sup>&nbsp;bytes) per hour
 +
|-
 +
! rowspan="2" | &nbsp;
 +
! colspan="4" | 48HP
 +
! rowspan="5" | &nbsp;
 +
! colspan="4" | 72HP
 
|-
 
|-
−
!
 
 
! 100 Hz
 
! 100 Hz
 
! 150 Hz
 
! 150 Hz
 
! 200 Hz
 
! 200 Hz
−
! 300 Hz
 
 
! 400 Hz
 
! 400 Hz
−
! 600 Hz
+
! 100 Hz
 +
! 150 Hz
 +
! 200 Hz
 +
! 400 Hz
 
|-
 
|-
 
! 25 rows
 
! 25 rows
−
| 12.9
+
| 0.58
−
| 19.3
+
| 0.86
−
| 25.7
+
| 1.15
−
| 38.6
+
| 2.30
−
| 51.5
+
| 1.15
−
| 77.2
+
| 1.73
 +
| 2.30
 +
| 4.61
 
|-
 
|-
 
! 33 rows
 
! 33 rows
−
| 17.0
+
| 0.76
−
| 25.5
+
| 1.14
 +
| 1.52
 +
| 3.04
 +
| 1.52
 +
| 2.28
 +
| 3.04
 +
| 6.08
 +
|-
 +
! 41 rows
 +
| 2.10
 +
| 3.15
 +
| 4.20
 +
| 8.40
 +
| 4.20
 +
| 6.30
 +
| 8.40
 +
| 16.79
 +
|}
 +
 
 +
 
 +
{| class="wikitable" style="text-align: right"
 +
|+ MCE data accumulation rate in Gigabytes (10<sup>9</sup>&nbsp;bytes) per day
 +
|-
 +
! rowspan="2" | &nbsp;
 +
! colspan="4" | 48HP
 +
! rowspan="5" | &nbsp;
 +
! colspan="4" | 72HP
 +
|-
 +
! 100 Hz
 +
! 150 Hz
 +
! 200 Hz
 +
! 400 Hz
 +
! 100 Hz
 +
! 150 Hz
 +
! 200 Hz
 +
! 400 Hz
 +
|-
 +
! 25 rows
 +
| 13.8
 +
| 20.7
 +
| 27.7
 +
| 55.3
 +
| 27.7
 +
| 41.5
 +
| 55.3
 +
| 110.6
 +
|-
 +
! 33 rows
 +
| 18.1
 +
| 27.4
 +
| 36.5
 +
| 73.0
 +
| 36.5
 +
| 54.7
 +
| 73.0
 +
| 146.0
 +
|-
 +
! 41 rows
 +
| 22.7
 
| 34.0
 
| 34.0
−
| 51.0
+
| 45.3
 +
| 90.7
 +
| 45.3
 
| 68.0
 
| 68.0
−
| 102.0
+
| 90.7
−
|-
+
| 181.4
−
! 41 rows
 
−
| 21.1
 
−
| 31.7
 
−
| 42.2
 
−
| 63.3
 
−
| 84.5
 
−
| 126.7
 
 
|}
 
|}
  
  
 
[[Category:Software]]
 
[[Category:Software]]

Revision as of 18:20, 30 November 2017

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.

Tables

Here are some tables of accumulation rates for both kinds of subracks for various data rates and numbers of rows:

MCE data accumulation rate in Megabits per second (Mbps)
  48HP   72HP
100 Hz 150 Hz 200 Hz 400 Hz 100 Hz 150 Hz 200 Hz 400 Hz
25 rows 1.28 1.92 2.56 5.12 2.56 3.84 5.12 10.24
33 rows 1.69 2.53 3.38 6.76 3.38 5.07 6.76 13.52
41 rows 0.94 1.42 1.89 3.78 1.42 2.83 3.78 7.56


MCE data accumulation rate in Gigabytes (109 bytes) per hour
  48HP   72HP
100 Hz 150 Hz 200 Hz 400 Hz 100 Hz 150 Hz 200 Hz 400 Hz
25 rows 0.58 0.86 1.15 2.30 1.15 1.73 2.30 4.61
33 rows 0.76 1.14 1.52 3.04 1.52 2.28 3.04 6.08
41 rows 2.10 3.15 4.20 8.40 4.20 6.30 8.40 16.79


MCE data accumulation rate in Gigabytes (109 bytes) per day
  48HP   72HP
100 Hz 150 Hz 200 Hz 400 Hz 100 Hz 150 Hz 200 Hz 400 Hz
25 rows 13.8 20.7 27.7 55.3 27.7 41.5 55.3 110.6
33 rows 18.1 27.4 36.5 73.0 36.5 54.7 73.0 146.0
41 rows 22.7 34.0 45.3 90.7 45.3 68.0 90.7 181.4
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