public String getRdmaProvider() {
    return getProperty(RDMA_PROVIDER, "auto");  // auto, disni, jxio, tcp
}

public int getRdmaReadWriteThreshold() {
    return getIntProperty(RDMA_READ_WRITE_THRESHOLD, 8192);  // 8KB
}

public int getRdmaMaxSendSize() {
    return getIntProperty(RDMA_MAX_SEND_SIZE, 65536);  // 64KB
}

public int getRdmaMaxReceiveSize() {
    return getIntProperty(RDMA_MAX_RECEIVE_SIZE, 65536);  // 64KB

      throws IOException {
    // Roughly size to match what has been read already. Some file systems, such as procfs, return 0
    // as their length. These files are very small, so it's wasteful to allocate an 8KB buffer.
    int initialBufferSize = min(BUFFER_SIZE, max(128, Integer.highestOneBit(totalLen) * 2));
    // Starting with an 8k buffer, double the size of each successive buffer. Smaller buffers

        if (this.rdmaProvider == null) {
            this.rdmaProvider = "auto";
        }
        if (this.rdmaReadWriteThreshold == 0) {
            this.rdmaReadWriteThreshold = 8192; // 8KB
        }
        if (this.rdmaMaxSendSize == 0) {
            this.rdmaMaxSendSize = 65536; // 64KB
        }
        if (this.rdmaMaxReceiveSize == 0) {
            this.rdmaMaxReceiveSize = 65536; // 64KB

	// larger chunks as the source of the write, as when the source
	// is too large we are basically just thrashing the CPU D-cache.
	// So if the result length is larger than an empirically-found
	// limit (8KB), we stop growing the source string once the limit
	// is reached and keep reusing the same source string - that
	// should therefore be always resident in the L1 cache - until we
	// have completed the construction of the result.