java - Heroku JVM 调优

Question

我在 Heroku 的 Play2 框架上编写了一个应用程序，但遇到内存问题。

2013-03-21T01:28:35+00:00 heroku[web.1]: Process running mem=543M(106.1%)
2013-03-21T01:28:35+00:00 heroku[web.1]: Error R14 (Memory quota exceeded)

在本地，我在 Heroku (512MB) 上使用相同的 JVM 设置和内存限制对其进行了分析，但当我在 Heroku 上发送请求时，它几乎立即运行了我们的堆空间。

JAVA_OPTS:    -Xmx384m -Xss512k -XX:+UseCompressedOops

如果我可以分析那里发生的事情，我就不会有任何问题，但 java-agent 似乎对我有用。

我还没有遇到任何我见过的内存泄漏。我确实知道我创建的每个对象都只会使用一次，这样我就可以让我的年轻一代变大，让我的老一代变小。我尝试了不同的 JVM 值，但似乎无法找到正确的组合来使它在没有正确分析的情况下工作。

我已经阅读了所有关于调优等的 Heroku 文档，但都无济于事。有人对此有任何想法，或者可以指出正确的方向吗？

编辑

我仍然无法让远程监控正常工作，但这是我本地测试系统在 1 个完整 CG 之前和之后的一些转储。

{Heap before GC invocations=1747 (full 0):
 PSYoungGen      total 42496K, used 42496K [0x00000000f5560000, 0x00000000fded0000, 0x0000000100000000)
  eden space 42176K, 100% used [0x00000000f5560000,0x00000000f7e90000,0x00000000f7e90000)
  from space 320K, 100% used [0x00000000fde80000,0x00000000fded0000,0x00000000fded0000)
  to   space 640K, 0% used [0x00000000fdd90000,0x00000000fdd90000,0x00000000fde30000)
 PSOldGen        total 106176K, used 105985K [0x00000000e0000000, 0x00000000e67b0000, 0x00000000f5560000)
  object space 106176K, 99% used [0x00000000e0000000,0x00000000e67804c8,0x00000000e67b0000)
 PSPermGen       total 43712K, used 43684K [0x00000000d5a00000, 0x00000000d84b0000, 0x00000000e0000000)
  object space 43712K, 99% used [0x00000000d5a00000,0x00000000d84a9338,0x00000000d84b0000)
2013-03-21T14:09:36.827-0700: [GC [PSYoungGen: 42496K->384K(41536K)] 148481K->106450K(147712K), 0.0027940 secs] [Times: user=0.02 sys=0.00, real=0.00 secs] 
Heap after GC invocations=1747 (full 0):
 PSYoungGen      total 41536K, used 384K [0x00000000f5560000, 0x00000000fde90000, 0x0000000100000000)
  eden space 41152K, 0% used [0x00000000f5560000,0x00000000f5560000,0x00000000f7d90000)
  from space 384K, 100% used [0x00000000fdd90000,0x00000000fddf0000,0x00000000fddf0000)
  to   space 640K, 0% used [0x00000000fddf0000,0x00000000fddf0000,0x00000000fde90000)
 PSOldGen        total 106176K, used 106066K [0x00000000e0000000, 0x00000000e67b0000, 0x00000000f5560000)
  object space 106176K, 99% used [0x00000000e0000000,0x00000000e6794968,0x00000000e67b0000)
 PSPermGen       total 43712K, used 43684K [0x00000000d5a00000, 0x00000000d84b0000, 0x00000000e0000000)
  object space 43712K, 99% used [0x00000000d5a00000,0x00000000d84a9338,0x00000000d84b0000)
}
{Heap before GC invocations=1748 (full 1):
 PSYoungGen      total 41536K, used 384K [0x00000000f5560000, 0x00000000fde90000, 0x0000000100000000)
  eden space 41152K, 0% used [0x00000000f5560000,0x00000000f5560000,0x00000000f7d90000)
  from space 384K, 100% used [0x00000000fdd90000,0x00000000fddf0000,0x00000000fddf0000)
  to   space 640K, 0% used [0x00000000fddf0000,0x00000000fddf0000,0x00000000fde90000)
 PSOldGen        total 106176K, used 106066K [0x00000000e0000000, 0x00000000e67b0000, 0x00000000f5560000)
  object space 106176K, 99% used [0x00000000e0000000,0x00000000e6794968,0x00000000e67b0000)
 PSPermGen       total 43712K, used 43684K [0x00000000d5a00000, 0x00000000d84b0000, 0x00000000e0000000)
  object space 43712K, 99% used [0x00000000d5a00000,0x00000000d84a9338,0x00000000d84b0000)
2013-03-21T14:09:36.830-0700: [Full GC [PSYoungGen: 384K->0K(41536K)] [PSOldGen: 106066K->13137K(52224K)] 106450K->13137K(93760K) [PSPermGen: 43684K->43684K(87936K)], 0.0666250 secs] [Times: user=0.06 sys=0.01, real=0.07 secs] 
Heap after GC invocations=1748 (full 1):
 PSYoungGen      total 41536K, used 0K [0x00000000f5560000, 0x00000000fde90000, 0x0000000100000000)
  eden space 41152K, 0% used [0x00000000f5560000,0x00000000f5560000,0x00000000f7d90000)
  from space 384K, 0% used [0x00000000fdd90000,0x00000000fdd90000,0x00000000fddf0000)
  to   space 640K, 0% used [0x00000000fddf0000,0x00000000fddf0000,0x00000000fde90000)
 PSOldGen        total 52224K, used 13137K [0x00000000e0000000, 0x00000000e3300000, 0x00000000f5560000)
  object space 52224K, 25% used [0x00000000e0000000,0x00000000e0cd4528,0x00000000e3300000)
 PSPermGen       total 87936K, used 43684K [0x00000000d5a00000, 0x00000000dafe0000, 0x00000000e0000000)
  object space 87936K, 49% used [0x00000000d5a00000,0x00000000d84a9338,0x00000000dafe0000)
}

编辑

这是我能得到的 -- 这并不多，但这是在 100 个请求之后发生的一切，因为一切都开始降级，你可以看到 web.2 已经在此转储中交换

2013-03-21T22:24:23+00:00 heroku[web.1]: source=heroku.13369226.web.1.d615093e-77a3-42b1-8da1-a228bd7582a1 measure=load_avg_1m val=0.41
2013-03-21T22:24:23+00:00 heroku[web.1]: source=heroku.13369226.web.1.d615093e-77a3-42b1-8da1-a228bd7582a1 measure=memory_total val=246.95 units=MB
2013-03-21T22:24:23+00:00 heroku[web.1]: source=heroku.13369226.web.1.d615093e-77a3-42b1-8da1-a228bd7582a1 measure=memory_rss val=246.91 units=MB
2013-03-21T22:24:23+00:00 heroku[web.1]: source=heroku.13369226.web.1.d615093e-77a3-42b1-8da1-a228bd7582a1 measure=memory_cache val=0.05 units=MB
2013-03-21T22:24:23+00:00 heroku[web.1]: source=heroku.13369226.web.1.d615093e-77a3-42b1-8da1-a228bd7582a1 measure=memory_swap val=0.00 units=MB
2013-03-21T22:24:23+00:00 heroku[web.1]: source=heroku.13369226.web.1.d615093e-77a3-42b1-8da1-a228bd7582a1 measure=memory_pgpgin val=72259 units=pages
2013-03-21T22:24:23+00:00 heroku[web.1]: source=heroku.13369226.web.1.d615093e-77a3-42b1-8da1-a228bd7582a1 measure=memory_pgpgout val=9039 units=pages
2013-03-21T22:24:25+00:00 heroku[web.2]: source=heroku.13369226.web.2.cb423d08-dd15-41c1-9843-95bcdc269111 measure=load_avg_1m val=0.30
2013-03-21T22:24:25+00:00 heroku[web.2]: source=heroku.13369226.web.2.cb423d08-dd15-41c1-9843-95bcdc269111 measure=memory_total val=532.83 units=MB
2013-03-21T22:24:25+00:00 heroku[web.2]: source=heroku.13369226.web.2.cb423d08-dd15-41c1-9843-95bcdc269111 measure=memory_rss val=511.86 units=MB
2013-03-21T22:24:25+00:00 heroku[web.2]: source=heroku.13369226.web.2.cb423d08-dd15-41c1-9843-95bcdc269111 measure=memory_cache val=0.04 units=MB
2013-03-21T22:24:25+00:00 heroku[web.2]: source=heroku.13369226.web.2.cb423d08-dd15-41c1-9843-95bcdc269111 measure=memory_swap val=20.93 units=MB
2013-03-21T22:24:25+00:00 heroku[web.2]: source=heroku.13369226.web.2.cb423d08-dd15-41c1-9843-95bcdc269111 measure=memory_pgpgin val=145460 units=pages
2013-03-21T22:24:25+00:00 heroku[web.2]: source=heroku.13369226.web.2.cb423d08-dd15-41c1-9843-95bcdc269111 measure=memory_pgpgout val=14414 units=pages
2013-03-21T22:24:25+00:00 heroku[web.2]: Process running mem=532M(104.1%)
2013-03-21T22:24:25+00:00 heroku[web.2]: Error R14 (Memory quota exceeded)
2013-03-21T22:24:29+00:00 heroku[web.4]: source=heroku.13369226.web.4.25274242-a3af-4d2e-9da3-44e5e0a45c09 measure=load_avg_1m val=1.83
2013-03-21T22:24:29+00:00 heroku[web.4]: source=heroku.13369226.web.4.25274242-a3af-4d2e-9da3-44e5e0a45c09 measure=memory_total val=400.66 units=MB
2013-03-21T22:24:29+00:00 heroku[web.4]: source=heroku.13369226.web.4.25274242-a3af-4d2e-9da3-44e5e0a45c09 measure=memory_rss val=400.61 units=MB
2013-03-21T22:24:29+00:00 heroku[web.4]: source=heroku.13369226.web.4.25274242-a3af-4d2e-9da3-44e5e0a45c09 measure=memory_cache val=0.05 units=MB
2013-03-21T22:24:29+00:00 heroku[web.4]: source=heroku.13369226.web.4.25274242-a3af-4d2e-9da3-44e5e0a45c09 measure=memory_swap val=0.00 units=MB
2013-03-21T22:24:29+00:00 heroku[web.4]: source=heroku.13369226.web.4.25274242-a3af-4d2e-9da3-44e5e0a45c09 measure=memory_pgpgin val=113336 units=pages
2013-03-21T22:24:29+00:00 heroku[web.4]: source=heroku.13369226.web.4.25274242-a3af-4d2e-9da3-44e5e0a45c09 measure=memory_pgpgout val=10767 units=pages
2013-03-21T22:24:29+00:00 heroku[web.3]: source=heroku.13369226.web.3.2132f01f-94b1-4151-8fa8-09cdb2774919 measure=load_avg_1m val=0.25
2013-03-21T22:24:29+00:00 heroku[web.3]: source=heroku.13369226.web.3.2132f01f-94b1-4151-8fa8-09cdb2774919 measure=memory_total val=397.70 units=MB
2013-03-21T22:24:29+00:00 heroku[web.3]: source=heroku.13369226.web.3.2132f01f-94b1-4151-8fa8-09cdb2774919 measure=memory_rss val=397.64 units=MB
2013-03-21T22:24:29+00:00 heroku[web.3]: source=heroku.13369226.web.3.2132f01f-94b1-4151-8fa8-09cdb2774919 measure=memory_cache val=0.05 units=MB
2013-03-21T22:24:29+00:00 heroku[web.3]: source=heroku.13369226.web.3.2132f01f-94b1-4151-8fa8-09cdb2774919 measure=memory_swap val=0.00 units=MB
2013-03-21T22:24:29+00:00 heroku[web.3]: source=heroku.13369226.web.3.2132f01f-94b1-4151-8fa8-09cdb2774919 measure=memory_pgpgin val=112163 units=pages
2013-03-21T22:24:29+00:00 heroku[web.3]: source=heroku.13369226.web.3.2132f01f-94b1-4151-8fa8-09cdb2774919 measure=memory_pgpgout val=10353 units=pages

Answer 1

我遇到了同样的问题。 Heroku 告诉你机器内存不足，而不是 Java VM。 Heroku Play 2.2 部署中实际上存在一个错误，启动脚本读取 java_opts，而不是 JAVA_OPTS。

我通过设置两者来修复它:

heroku config:add java_opts='-Xmx384m -Xms384m -Xss512k -XX:+UseCompressedOops'
heroku config:add JAVA_OPTS='-Xmx384m -Xms384m -Xss512k -XX:+UseCompressedOops'

我还必须设置 -Xms，否则我会收到一条错误消息，指出最小值和最大值不兼容。我猜 Play2.2 使用的默认值高于 384m。

要找出您使用的总内存，this is a useful equation (Java 8 之前):

最大内存 = [-Xmx] + [-XX:MaxPermSize] + number_of_threads * [-Xss]