Средняя загрузка и количество процессоров

436
Joyce Babu

Если у меня процессор с 8 ядрами, нормально ли иметь постоянную среднюю нагрузку 2,5? Или он всегда должен оставаться ниже 1, независимо от количества процессоров / ядер?

1
2.5 что именно? Ramhound 10 лет назад 0
Средняя нагрузка с выхода `uptime`. Joyce Babu 10 лет назад 0

2 ответа на вопрос

1
David Schwartz

Да. Не существует определенной средней нагрузки, которая подходит или не подходит, и поскольку средняя загрузка измеряет ввод-вывод, а также загрузку процессора, количество ядер в основном не имеет значения. Если система работает приемлемо, то это приемлемо. Если нет, то нет.

1
Ely

Let me cite from my training's documentation. This will answer your question.

The load average is displayed using three different sets of numbers, as shown in the following example:

The last piece of information is the average load of the system. Assuming our system is a single-CPU system, the 0.25 means that for the past minute, on average, the system has been 25% utilized. 0.12 in the next position means that over the past 5 minutes, on average, the system has been 12% utilized; and 0.15 in the final position means that over the past 15 minutes, on average, the system has been 15% utilized. If we saw a value of 1.00 in the second position, that would imply that the single-CPU system was 100% utilized, on average, over the past 5 minutes; this is good if we want to fully use a system. A value over 1.00 for a single-CPU system implies that the system was over-utilized: there were more processes needing CPU than CPU was available.

If we had more than one CPU, say a quad-CPU system, we would divide the load average numbers by the number of CPUs. In this case, for example, seeing a 1 minute load average of 4.00 implies that the system as a whole was 100% (4.00/4) utilized during the last minute.

Short term increases are usually not a problem. A high peak you see is likely a burst of activity, not a new level. For example, at start up, many processes start and then activity settles down. If a high peak is seen in the 5 and 15 minute load averages, it would may be cause for concern.

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