Comments on: Watts, MIPs, and Google http://cafe.elharo.com/hardware/watts-mips-and-google/ Longer than a blog; shorter than a book Tue, 06 Jan 2009 07:23:04 +0000 http://wordpress.org/?v=2.6.3 By: Samuel http://cafe.elharo.com/hardware/watts-mips-and-google/#comment-104828 Samuel Mon, 25 Jun 2007 00:07:11 +0000 http://cafe.elharo.com/hardware/watts-mips-and-google/#comment-104828 Stack-architecture CPUs will consume even less power, since they have even fewer transistors than ARM, and do not require a pipeline (since all instructions execute as-is in a single-cycle). There is no need for speculative execution, since all the data you're immediate computation will need is already on the stack, or is being prefetched via explicit instructions that have already executed. Stack-architecture CPUs will consume even less power, since they have even fewer transistors than ARM, and do not require a pipeline (since all instructions execute as-is in a single-cycle). There is no need for speculative execution, since all the data you’re immediate computation will need is already on the stack, or is being prefetched via explicit instructions that have already executed.

]]> By: Chris http://cafe.elharo.com/hardware/watts-mips-and-google/#comment-74690 Chris Sun, 08 Apr 2007 10:14:38 +0000 http://cafe.elharo.com/hardware/watts-mips-and-google/#comment-74690 I wonder whether building servers based on multiple ARM RISC chips would make a difference. Those chips only draw a small wattage (ARM 11 0.6mW/MHz (0.13µm, 1.2V) including cache controllers). Even a multi CPU set up per server would look like it would use less power than CISC based servers. I wonder whether building servers based on multiple ARM RISC chips would make a difference. Those chips only draw a small wattage (ARM 11 0.6mW/MHz (0.13µm, 1.2V) including cache controllers). Even a multi CPU set up per server would look like it would use less power than CISC based servers.

]]> By: Ann E. Mouse http://cafe.elharo.com/hardware/watts-mips-and-google/#comment-74536 Ann E. Mouse Sun, 08 Apr 2007 01:00:49 +0000 http://cafe.elharo.com/hardware/watts-mips-and-google/#comment-74536 Ah: Barroso did not know how many of the disks that did not fail also reported errors. That is there are four groups of disks: Fail, reported errors Fail, did not report errors Did not fail, reported errors ... He only had numbers for the first three. That sentence says he didn't have data for group #3 but then you say the opposite. Ah:

Barroso did not know how many of the disks that did not fail also reported errors. That is there are four groups of disks:

Fail, reported errors
Fail, did not report errors
Did not fail, reported errors
…

He only had numbers for the first three.

That sentence says he didn’t have data for group #3 but then you say the opposite.

]]> By: eas http://cafe.elharo.com/hardware/watts-mips-and-google/#comment-74042 eas Fri, 06 Apr 2007 23:53:23 +0000 http://cafe.elharo.com/hardware/watts-mips-and-google/#comment-74042 Luis, I'm pretty sure that google adopted DC-DC power supplies for servers a couple years back. Some of the highest capacity long-haul power transmission lines are DC, but I don't know if going from hundreds of kV DC to Luis, I’m pretty sure that google adopted DC-DC power supplies for servers a couple years back.

Some of the highest capacity long-haul power transmission lines are DC, but I don’t know if going from hundreds of kV DC to

]]> By: Luis http://cafe.elharo.com/hardware/watts-mips-and-google/#comment-74027 Luis Fri, 06 Apr 2007 21:56:29 +0000 http://cafe.elharo.com/hardware/watts-mips-and-google/#comment-74027 I wonder if changing from AC Power supplies to DC power supplies on servers would help. We have some telco switches in our data center- I was talking to one of the telco guys, who pointed out that they have 48V DC power going straight into their equipment. But, for our computer servers, we have to bring in AC power, turn it into DC power for the battery and UPS, then turn that DC power in AC power for the power supplies in the servers, which in turn turn the power back into DC for the chip. I know that there are some 3rd party power supplies that will take 48V DC, but you'd think this type of thing would be standard for data centers. I wonder if changing from AC Power supplies to DC power supplies on servers would help. We have some telco switches in our data center- I was talking to one of the telco guys, who pointed out that they have 48V DC power going straight into their equipment.

But, for our computer servers, we have to bring in AC power, turn it into DC power for the battery and UPS, then turn that DC power in AC power for the power supplies in the servers, which in turn turn the power back into DC for the chip.

I know that there are some 3rd party power supplies that will take 48V DC, but you’d think this type of thing would be standard for data centers.

]]> By: Marc Adams http://cafe.elharo.com/hardware/watts-mips-and-google/#comment-73877 Marc Adams Fri, 06 Apr 2007 14:30:53 +0000 http://cafe.elharo.com/hardware/watts-mips-and-google/#comment-73877 One of the larger issues in powering data centers is keeping the equipment cooled. It costs more to cool a data center than the servers and the electricity to power them. In-Row cooling configurations help pinpoint the supply / demand for cooling which helps but more needs to be done. One of the larger issues in powering data centers is keeping the equipment cooled. It costs more to cool a data center than the servers and the electricity to power them. In-Row cooling configurations help pinpoint the supply / demand for cooling which helps but more needs to be done.

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