q EF HLD on SMP machine q Subfarm design q Distributor Global Buffer q Tests and results q Future developments
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1 q EF HLD on SMP machine q Subfarm design q Distributor Global Buffer q Tests and results q Future developments Andrea Negri Giacomo Polesello Diana Scannicchio Cristian Stanescu Valerio Vercesi 1Diana Scannicchio (D.F.N.T. and I.N.F.N of Pavia) - Event Filter meeting - Geneve 18 Mar 1999
2 2Diana Diana Scannicchio (D.F.N.T. and I.N.F.N of Pavia) - Event Filter meeting - Geneve 18 Mar 1999 Symmetric Multi Processor We have implemented the Event Filter subfarm on a symmetric multiprocessor machine : 4 CPU HP K220 running version 11 (kernel thread based) of the HP-UX operating system To better exploit the hardware architecture (data sharing and communications) the subfarm code uses a multithreaded implementation We have a single multithreaded process and to each components of the EF subfarm is assigned a thread in the 1x1 scheduling model: the thread is scheduled directly by the kernel The POSIX-10 thread standard has been used to ensure the portability of the code on different platforms (SUN, DIGITAL, LINUX...)
3 Subfarm Design SFI Event backup Storage SFO 3Diana Scannicchio (D.F.N.T. and I.N.F.N of Pavia) - Event Filter meeting - Geneve 18 Mar 1999 delete event backup Distributor FIFO (physics) Distributor FIFO (calibration) PT PT PT PT cal. PT cal. Collector FIFO Supervisor
4 4Diana Diana Scannicchio (D.F.N.T. and I.N.F.N of Pavia) - Event Filter meeting - Geneve 18 Mar 1999 Subfarm Design The Distributor and the Collector are implemented by FIFOs The availability of the FIFOs resources regulates the flow of the events in the subfarm In the current implementation the SFI or injector thread has the ability to select events of differing type (e.g. physics, calibration) in order to process them with different processing tasks To simulate calibration events the event type (available in the event header) is changed for a fraction of the total events and they are padded to a smaller size (100 KB instead of 1000 KB) The events are eventually stored in the DGB and fill two Distributor FIFOs according to their event type
5 5Diana Diana Scannicchio (D.F.N.T. and I.N.F.N of Pavia) - Event Filter meeting - Geneve 18 Mar 1999 Then the physics PT threads and the calibration PT threads get the corresponding events, process them and fill the Collector FIFO with the output events The physics PT runs the Calorec++ reconstruction software (by C. Meessen) modified for the multithread environment The calibration PT consumes CPU by means of mathematical operation (loops of sqrt and exp on memory locations); their processing time is ~10% of the Calorec++ PT A filter has been implemented inside the physics PTs: it randomly rejects a fraction of the events (typically 90%). The rejected events are therefore removed from DGB and the filtered ones fill the Collector FIFO Finally a SFO thread empties the Collector FIFO and eventually writes the events on a disk for the final storage
6 6Diana Diana Scannicchio (D.F.N.T. and I.N.F.N of Pavia) - Event Filter meeting - Geneve 18 Mar 1999 Distributor Global Buffer < The DGB has to ensure that events are not lost during their passage through the farm < In our implementation the DGB is a disk partition on which the events are stored as different files (whose names are stored in the FIFOs) < The events are removed when they are rejected by the PT or after having been disposed of by the SFO < In case of a crash the events remained in the DGB are firstly processed when the subfarm restarts < At the end of run no event remains in the DGB A simple supervision component allows for controlling the subfarm and monitoring its status
7 7Diana Diana Scannicchio (D.F.N.T. and I.N.F.N of Pavia) - Event Filter meeting - Geneve 18 Mar 1999 Preliminary Tests: Conditions We have performed tests modifying initial conditions: The number of PTs ( physics and calibration ) The dimension of the events The processing time (running more times the reconstruction software to simulate different realistic values) The use of the DGB The final writing of accepted events on disk The dimension of the MC events (~50 KB) is scaled up to 1 MB with random data to simulate the realistic size of an ATLAS event and to 100 KB to simulate the calibration events Every run consists of more than events We have performed also a duration test: the subfarm processed more than 4 millions events in 3 days without any problem
8 8Diana Diana Scannicchio (D.F.N.T. and I.N.F.N of Pavia) - Event Filter meeting - Geneve 18 Mar 1999 Preliminary Tests: Results The software and hardware architectures do not limit the behaviour of the subfarm The global throughput is independent from the number of PT ( 4) and is inversely proportional to the processing time Running concurrently the two different types of PTs ( physics and calibration ) does not change the load balancing: each PT is balanced with the others of the same type The previous result is not affected by the relative composition in the number of PTs The DGB influences the performance as expected With the filter rejecting 90% of the events the final storage on disk does not modify the subfarm performance
9 Throughput vs. number of PTs event size 1 MB number of PTs 9Diana Scannicchio (D.F.N.T. and I.N.F.N of Pavia) - Event Filter meeting - Geneve 18 Mar 1999 throughput (Hz)
10 Diana Scannicchio (D.F.N.T. and I.N.F.N of Pavia) - Event Filter meeting - Geneve 18 Mar Throughput 1000 event size 1 MB event size 250 KB throughput (Hz) processing time (a. u.) One processing time unit is ~220 msec
11 Diana Scannicchio (D.F.N.T. and I.N.F.N of Pavia) - Event Filter meeting - Geneve 18 Mar Load Balancing 8 physics PT and 8 calibration PT
12 Diana Scannicchio (D.F.N.T. and I.N.F.N of Pavia) - Event Filter meeting - Geneve 18 Mar Load Balancing 16 physics PT and 4 calibration PT
13 Diana Scannicchio (D.F.N.T. and I.N.F.N of Pavia) - Event Filter meeting - Geneve 18 Mar Throughput 24 event size 1 MB throughput (Hz) fraction of events rejected (%) Filtering the events and writing them on a disk
14 Diana Scannicchio (D.F.N.T. and I.N.F.N of Pavia) - Event Filter meeting - Geneve 18 Mar 1999 Perform tests on MP SUN, DEC and LINUX platforms The code has already been ported on SUN and DEC and it runs on single processor machines but we have no MP to run onto (Frederic are you listening?) In the case of LINUX OS minor changes has been applied to the code due to the different level of the POSIX standard draft (4 instead of 10) implemented The C++ implementation of the program is going on and needs discussion with the others prototype developers Still working on error recovery subfarm supervision Future Developments 14
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