public synchronized void workerIterationEnd(final Memory memory) {
        for (final VertexProgram<?> vertexProgram : this.pool) {
            vertexProgram.workerIterationEnd(memory);
        }
    }
@author Marko A. Rodriguez (http://markorodriguez.com)
gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/process/computer/util/VertexProgramPool.java