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MongoDB与内存 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...5320k used, 2806804k free, 245020k buffers
Swap: 2097144k total, 100k used, 2097044k free, 26482048k cached
VIRT RES SHR %MEM
1892g 21g 21g 69.6
这台MongoDB服务器有没有性能问题？大家可以一边思考一边继续阅读。
先讲讲Linux是如何管理内存的
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How to get UTC timestamp in Ruby?
...you need anything else, a scalar value, e.g. seconds since the Unix epoch, 100-ns intervals since 1601 or maybe a string for display purposes or storing the timestamp in a database, you can readily get that from the object. But that depends very much on your intended use.
Saying that »a true times...
UnicodeDecodeError, invalid continuation byte
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In binary, 0xE9 looks like 1110 1001. If you read about UTF-8 on Wikipedia, you’ll see that such a byte must be followed by two of the form 10xx xxxx. So, for example:
>>> b'\xe9\x80\x80'.decode('utf-8')
u'\u9000'
But that’s just the mechani...
converting Java bitmap to byte array
...eam = new ByteArrayOutputStream();
bmp.compress(Bitmap.CompressFormat.PNG, 100, stream);
byte[] byteArray = stream.toByteArray();
bmp.recycle();
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Convert Long into Integer
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You'll need to type cast it.
long i = 100L;
int k = (int) i;
Bear in mind that a long has a bigger range than an int so you might lose data.
If you are talking about the boxed types, then read the documentation.
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How to set margin of ImageView using code, not xml
...ew RelativeLayout.LayoutParams(image.getLayoutParams());
lp.setMargins(50, 100, 0, 0);
image.setLayoutParams(lp);
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Get the last item in an array
... it won't be noticable (iirc slowdown compared to arr[arr.length-1] was 50-100x)
– kritzikratzi
Jun 2 at 18:54
5
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Where are iOS simulator screenshots stored?
...at ~/Library/Application Support/iPhone Simulator/***version***/Media/DCIM/100APPLE
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Make an image width 100% of parent div, but not bigger than its own width
...nt div, but only as long as that width isn’t wider than its own width at 100%. I’ve tried this, to no avail:
9 Answers
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Converting strings to floats in a DataFrame
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