java – 在h2o中加载大于内存大小的数据

我正在尝试加载大于h2o内存大小的数据.

H2o blog提到：关于Bigger Data和GC的说明：当Java堆太满时,我们进行用户模式交换到磁盘,即,您使用的数据量大于物理DRAM.我们不会死于GC死亡螺旋,但我们会降低到核心外速度.我们会像磁盘允许的那样快.我个人测试过将12Gb数据集加载到2Gb(32位)JVM中;加载数据大约需要5分钟,另外还需要5分钟才能运行Logistic回归.

这是连接到h2o 3.6.0.8的R代码：

h2o.init(max_mem_size = '60m') # alloting 60mb for h2o,R is running on 8GB RAM machine

给

java version "1.8.0_65"
Java(TM) SE Runtime Environment (build 1.8.0_65-b17)
Java HotSpot(TM) 64-Bit Server VM (build 25.65-b01,mixed mode)

.Successfully connected to http://127.0.0.1:54321/ 

R is connected to the H2O cluster: 
    H2O cluster uptime:         2 seconds 561 milliseconds 
    H2O cluster version:        3.6.0.8 
    H2O cluster name:           H2O_started_from_R_RILITS-HWLTP_tkn816 
    H2O cluster total nodes:    1 
    H2O cluster total memory:   0.06 GB 
    H2O cluster total cores:    4 
    H2O cluster allowed cores:  2 
    H2O cluster healthy:        TRUE 

Note:  As started,H2O is limited to the CRAN default of 2 cpus.
       Shut down and restart H2O as shown below to use all your cpus.
           > h2o.shutdown()
           > h2o.init(nthreads = -1)

IP Address: 127.0.0.1 
Port      : 54321 
Session ID: _sid_b2e0af0f0c62cd64a8fcdee65b244d75 
Key Count : 3

我试图将169 MB的csv加载到h2o中.

dat.hex <- h2o.importFile('dat.csv')

哪个错了,

Error in .h2o.__checkConnectionHealth() : 
  H2O connection has been severed. Cannot connect to instance at http://127.0.0.1:54321/
Failed to connect to 127.0.0.1 port 54321: Connection refused

这表明内存不足error.

Question: If H2o promises loading a data set larger than its memory capacity(swap to disk mechanism as the blog quote above says),is this the correct way to load the data?

解决方法

默认情况下,默认情况下已禁用交换到磁盘,因为性能非常糟糕.最前沿(不是最新的稳定版)有一个标志可以启用它：“ – clean”“(用于”内存清理器“).
请注意,您的群集具有极小的内存：
H2O集群总内存：0.06 GB
那是60MB！勉强可以启动JVM,更不用说运行H2O了.如果H2O可以在那里正常出现,我会感到惊讶,更别提了交换到磁盘.交换仅限于单独交换数据.如果您正在尝试进行交换测试,请将JVM升级到1或2 Gigs ram,然后加载总和超过该值的数据集.

悬崖

java – 在h2o中加载大于内存大小的数据

解决方法

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