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General Impressions
The "CUG Night Out" was a Canal Cruise on the 'Prins van Oranje' (built 1908). From Leiderdorp, we toured Dutch countryside... drawbridges, windmills, houses, flowers. Food was provided, of course, and a good opportunity to chat with others. Interesting feature to note: the water level in the canal was frequently above the surrounding land. An observation on Dutch housing (from cruise and walking about): many had large picture windows without blinds, one could see through the house from the streets... considering the art objects on many sills it seemed intentionally "open".
T90 -> SV1 -> SV2
T3E -> SV2
-> SV2 -> SV3
MTA -> MTA-2 -> MTA-3 -> .....
SV2 architecture combines T3E scalability w/ sustained, high bandwidth vector performance
CUG Members meeting to discuss some proposed modifications
An ARSC user recently received this error message:
-MPI- FATAL: Remote protocol queue fullThis is the Cray discussion in a problem report on the subject:
The "Remote protocol queue full" error means the shared memory queue area used for buffering messages has filled up. This typically occurs when a PE(s) is sending messages to another PE faster than that PE can receive them. The solution is to use environment variable MPI_SM_POOL to increase the size of the shared memory pool. The default size for MPI_SM_POOL is 8192 bytres. See section 2.7 of "Message Passing Toolkit: MPI Programmer's Manual" for additional information. MPI will be changed in a future release so that send operations will block when a "queue full" condition occurs.
We got five answers from four readers in Minnesota, Mississippi, and Alaska:
Close Encounters: What To DoQ: I re-use the same qsub script in different directories, copying it around as I change data sets.
If you see a bear, avoid it if you can. Give the bear every opportunity to avoid you. If you do encounter a bear at close distance, remain calm. Attacks are rare. Chances are, you are not in danger. Most bears are interested only in protecting food, cubs or their "personal space." Once the threat is removed, they will move on. Remember the following:Identify Yourself: Let the bear know you are human. Talk to the bear in a normal voice. Wave your arms. [...] You may try to back away slowly diagonally, but if the bear follows, stop and hold your ground.
Don't Run: You can't outrun bear. They have been clocked at speeds up to 35 mph, and like dogs, they will chase fleeing animals. Bears often make bluff charges, sometimes to within 10 feet of their adversary, without making contact. Continue waving your arms and talking to the bear. If the bear gets too close, raise your voice and be more aggressive. Bang pots and pans. Use noisemakers. Never imitate bear sounds or make a high-pitched squeal.
If Attacked: If a bear actually makes contact, surrender! Fall to the ground and play dead. Lie flat on your stomach, or curl up in a ball with your hands behind your neck. Typically, a bear will break off its attack once it feels the threat has been eliminated. [...] In rare instances, particularly with black bears, an attacking bear may perceive a person as food. If the bear continues biting you long after you assume a defensive posture, it likely is a predatory attack. Fight back vigorously.
Protection
Firearms should never be used as an alternative to common-sense approaches to bear encounters. If you are inexperienced with a firearm in emergency situations, you are more likely to be injured by a gun than a bear. It is illegal to carry firearms in some of Alaska's national parks, so check before you go.A .300-Magnum rifle or a 12-gauge shotgun with rifled slugs are appropriate weapons if you have to shoot a bear. Heavy handguns such as a .44-Magnum may be inadequate in emergency situations, especially in untrained hands.
Defensive aerosol sprays which contain capsicum (red pepper extract) have been used with some success for protection against bears. These sprays may be effective at a range of 6-8 yards. If discharged upwind or in a vehicle, they can disable the user. Take appropriate precautions. If you carry a spray can, keep it handy and know how to use it.
The first command in the script is a "cd" right back to the directory from which I submit the script (the "cd" is required because NQS always starts the job in my home directory).
Thus, I must update the "cd" command in my script whenever I copy it to a new directory. It's BAD NEWS when I forget! Any advice?
[ Answers, questions, and tips graciously accepted. ]
Contact:
Thomas J. Baring ARSC Web Specialist ph: 907-450-8619 Donald Bahls ARSC User Consultant ph: 907-450-8674 Arctic Region Supercomputing Center University of Alaska Fairbanks PO Box 756020 Fairbanks AK 99775-6020
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Arctic Region Supercomputing Center
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