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To: Vattila who wrote (20844)10/3/2017 4:01:35 PM
From: neolib
of 21632
 
Yipes, the original version slowed down with increasing thread count!

The "fixed" version still doesn't scale terribly well with thread count although at least the sign is right! Look at what doubling the count from 16 to 32 does.

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To: neolib who wrote (20845)10/3/2017 4:06:41 PM
From: Vattila
of 21632
 

The poster explains the poor scaling. It is probably due to Amdahl's Law, a good portion of sequential code that is not speeded up by parallelisation.

"The speedup in the fixed section of the code is likely a fair bit higher than what's shown here."

But, yes, the case shows how easy it is to introduce a scaling problem if the programmer does not understand multi-threading and shared memory well. Luckily, the shared counter, in this case, was useless and could be removed.

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To: THE WATSONYOUTH who wrote (20837)10/3/2017 6:26:57 PM
From: Pravin Kamdar
of 21632
 
trades almost dead flat for 4 days and then jumps 5+% in an hour.............we are just along for the ride...........question is..... who has got the wheel??
Don't know. I can't see from the end of the chain behind the car.

Sold on the way up today. Uncomfortable with only 33% of my full load shares.

Pravin.

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To: neolib who wrote (20830)10/3/2017 6:31:15 PM
From: Pravin Kamdar
of 21632
 
Yeah, no reason to buy on the open market. They can, are, and will, just cut themselves as many zero basis options as they want -- for immediate sale.

Pravin.

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To: Vattila who wrote (20846)10/3/2017 7:43:16 PM
From: THE WATSONYOUTH
of 21632
 
the case shows how easy it is to introduce a scaling problem if the programmer does not understand multi-threading and shared memory well.


......at what point does one no longer call the process "optimization" but an original "screw up" ??

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To: bit3 who wrote (20839)10/3/2017 9:12:13 PM
From: THE WATSONYOUTH
of 21632
 
.........well.............that's how I intend to go................go to bed feeling fine......and wake up dead.........I think I'd prefer putting it off for a while though...............I'm 65

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To: THE WATSONYOUTH who wrote (20850)10/3/2017 10:00:29 PM
From: neolib
of 21632
 
Better make the most of the next year :)

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To: neolib who wrote (20851)10/3/2017 10:16:34 PM
From: Pravin Kamdar
of 21632
 
Better make the most of the next year :)
Seriously laughing out loud.

Let's make the best out of tomorrow. I'm on the one-day-at-a-time program.

Pravin.

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From: neolib10/4/2017 10:56:14 PM
of 21632
 
An interesting CPU twist:

eetimes.com;

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From: neolib10/5/2017 9:54:22 AM
of 21632
 
Coffee Lake reviews are up. About what was to be expected. The 8700 is in stock at Newegg (limit 1 per customer) while the 8700K appears sold out. Most the lower ones are in stock.

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