• How many hard faults are too many?

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    #495451

    I know what a hard fault is: a piece of code is not in RAM and must be retrieved from virtual. What I want to know is: how many hard faults per second are too many?

    I Googled until my fingertips were bruised. I could fill an entire hard drive with the same explanations of what a hard fault is, over and over in varying levels of detail. Even Microsoft’s Technet does it. In fact, they even say “A consistently high number of hard faults per second indicates” problems. But they don’t say how many is too many. What is “consistently high”?

    It seems like the kind of thing that might vary between 32 bit and 64 bit operating systems, but not from one system to the next. The number of hard faults per second that I see will vary greatly from system to the next, but the number that is “too much” should be pretty consistent. I imagine that a 64 bit PC with 2 Gb of RAM is going to have a lot of them and the same PC with 128Gb will have very few. And the former is going to perform worse than the latter. But the actual number per second seems like it would be pretty directly related to the user experience of system performance.

    So how many is too many?

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    • #1458682

      There is no specific number, it’s just indicative of insufficient memory. The hard disk type also affects what sort of performance hit you see, an SSD will obviously perform better than a mechanical disk.

      cheers, Paul

    • #1458710

      Well they sure give it a prominent place in the Resource Monitor for such a useless number. That article also suggests that one way to see if you are getting too many hard faults is to keep opening and using more and more programs until performance suffers. Then, depending on how realistic that load is, you decide whether you need more memory or not. Heck, that’s what I’ve been doing for 25 years. And what I’ll do now.

      Oh, about the SSD: I was hearing endless complaints about one of the systems in our store being tediously slow to use. It seemed to be more disk access related and so I put in an SSD. Problem solved and I’ve had not even a hint of a complaint since then. It was an Intel SSD; very nice, reliability figures way higher than any spinning platter drive. An easy swap, too. I liked it so much that when I built my almost really awesome desktop I didn’t even have to think about what I was going to use for the C drive. I still keep my data on a Velociraptor.

      • #1458719

        You’ve kind of answered your own question. When you say “It seemed to be more disk access related” about the tediously slow system, you have eliminated memory shortage, CPU shortage, network congestion, etc. The prominent entries in Resource Monitor are tools to help you narrow down performance problems to specific areas that you can address. In that context, they are useful. Outside that context (such as wondering how many are too many) I agree that they are well, just fun to watch.

        • #1458726

          You’ve kind of answered your own question. When you say “It seemed to be more disk access related” about the tediously slow system, you have eliminated memory shortage, CPU shortage, network congestion, etc. The prominent entries in Resource Monitor are tools to help you narrow down performance problems to specific areas that you can address. In that context, they are useful. Outside that context (such as wondering how many are too many) I agree that they are well, just fun to watch.

          That was a different system than the current one. My original question remains unanswered, but probably because there is no answer.

    • #1458715

      Maybe your store PC had too many hard faults? 🙂

      cheers, Paul

      • #1458725

        Maybe your store PC had too many hard faults? 🙂

        Actually, I sheepishly thought the same thing. Then I remembered that this system does a lot of disk intensive stuff and I watched the disk activity in the Resource Monitor and decided that was the problem. But you raise a good point. I really should take a look at hard faults on this system, just to keep an eye on it. It’s a wimpy little system that we ask a lot of.

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