Einstein @ Home

S5R3 Work Unit Crunch Time Ready Reckoner V3.0

Please follow these steps to obtain estimates of work unit behaviour

Step 1

Important Points To Read

All times are in seconds
Predictions are for data from a single machine only
Numeric fields will accept commas
For Step 5 data entry particularly :
- Minumum two inputs, and generally the more the better
- Zero or negative entries will cause that work unit to be ignored
- Choose a spread of work unit sequence numbers that use the same frequency.
- An expected average runtime is calculated for all work units at a given frequency
- If no error is quoted then none applies. Zero will be explicit.
You may of course return to a previous step and re-input any parameters.
Re-calculation is automatic after a given data entry, excepting use of the Use Estimates button.
NaN in a field indicates either an bad input somewhere earlier,
or an unacceptable calculation result ( various causes ).
This an UNOFFICIAL toy. No warranties are implied or express whatsoever
I would be very glad to receive any & all feedback ! ;-)

Enjoy!
Cheers, Mike

Step 2

Firstly we need to find and examine the work unit identifier. It looks rather like this :

h1_XXXX.XX_S5R2__YYY_S5R3a_??

XXXX.XX is a decimal number like 345.67 which is the search frequency F for the unit.
YYY is an integer number like 123 which is the sequence number S for the unit.

Open BOINC Manager and maximise the window.
For a running task you will find it by
- Select the Tasks tab
- Look in the column under the Name heading
Alternatively you could also find it by
- Select the Projects tab
- Highlight Einstein@Home in the column under the Project heading
- Click the Your results button toward the bottom of the Web Sites panel on the lower left
- This will open your browser at the page which shows your recent tasks including any pending ones
- Select a work unit of interest by clicking on one in the column under the Work unit ID click for details heading

Step 3

We will first calculate the period P of the work unit cycle.
This depends upon the sky search frequency F .

INPUT	Please enter the search frequency that you found ——>	= F
OPTIONAL	You may choose to enter a sky grid density constant here ——>	= D

OUTPUT	The cycle period for your work unit sequence is ——>	= P = D*F²
OUTPUT	Expect these sequence numbers to have highest runtimes ——>
OUTPUT	Expect these sequence numbers to have lowest runtimes ——>

Step 4

Now we will calculate the phase R of the work unit within the cycle, and sequence numbers with similar runtimes T.
This depends upon the work unit sequence number S and the period P.

INPUT	Please enter the sequence number ——>	= S

OUTPUT	Phase of work unit within sequence ——>	= R = S / P
OUTPUT	Similiar runtimes with ——>

Step 5 [ OPTIONAL ]

For a sequence of work units you may wish to attempt an estimation of peak runtime A and variance B.
This depends upon the running time T and sequence number S for each of 2 to 8 work units.
Please note this advice!

INPUT	Please enter runtime ——>			<—— Please enter sequence number
INPUT	Please enter runtime ——>			<—— Please enter sequence number
OPTIONAL	Please enter runtime ——>			<—— Please enter sequence number
OPTIONAL	Please enter runtime ——>			<—— Please enter sequence number
OPTIONAL	Please enter runtime ——>			<—— Please enter sequence number
OPTIONAL	Please enter runtime ——>			<—— Please enter sequence number
OPTIONAL	Please enter runtime ——>			<—— Please enter sequence number
OPTIONAL	Please enter runtime ——>			<—— Please enter sequence number

OUTPUT	Average runtime for ——>	= M = A[1 - B2 / Π]		<—— units at the given frequency
OUTPUT	Error ~ %	= A	= B	<——

Step 6

To finish we will calculate the expected runtime T of your work unit.
This depends upon estimates of the peak runtime A, the runtime variance B and the phase R.

INPUT	Please enter an estimate of peak runtime ——>	= A
INPUT	Please enter an estimate of runtime variance ——>	= B

OUTPUT	Estimated runtime of work unit ——>	= T = A[1 - B\|sin(Π*R)\|]